| 31 Aug 18 | K. Trapp Kevin Trapp |  Paris Saint-Germain PSG | → |  Eintracht FrankfurtSGE | Loan |
| 31 Aug 18 | K. Trapp Kevin Trapp | Paris Saint-Germain PSG | → | Eintracht FrankfurtSGE | Loan |
| 31 Aug 18 | J. Bernat Juan Bernat |  Bayern MunichMUN | → | Paris Saint-Germain PSG | Undisclosed |
| 31 Aug 18 | J. Bernat Juan Bernat | Bayern MunichMUN | → | Paris Saint-Germain PSG | Undisclosed |
| 31 Aug 18 | R. Bürki Roman Bürki |  Borussia DortmundDOR | → |  Werder BremenWER | Undisclosed |
| 31 Aug 18 | N. Sahin Nuri Sahin | Borussia DortmundDOR | → | Werder BremenWER | Undisclosed |
| 31 Aug 18 | Reiss Nelson |  ArsenalARS | → |  TSG HoffenheimHOF | Loan |
| 31 Aug 18 | M. Bähre Mike-Steven Bähre |  Hannover 96HAN | → |  BarnsleyBAR | Loan |
| 31 Aug 18 | Reiss Nelson | ArsenalARS | → | TSG HoffenheimHOF | Loan |
| 30 Aug 18 | P. de Blasis Pablo de Blasis |  MainzMAIN | → |  EibarEIB | Undisclosed |
| 30 Aug 18 | P. de Blasis Pablo de Blasis | MainzMAIN | → | EibarEIB | Undisclosed |
| 28 Aug 18 | P. Alcácer Paco Alcácer |  BarcelonaBAR | → | Borussia DortmundDOR | Loan |
| 28 Aug 18 | B. Henrichs Benjamin Henrichs |  Bayer LeverkusenLEV | → |  AS MonacoMON | Undisclosed |
| 28 Aug 18 | B. Henrichs Benjamin Henrichs | Bayer LeverkusenLEV | → | AS MonacoMON | Undisclosed |
| 28 Aug 18 | P. Alcácer Paco Alcácer | BarcelonaBAR | → | Borussia DortmundDOR | Loan |
| 27 Aug 18 | S. Rudy Sebastian Rudy | Bayern MunichMUN | → |  Schalke 04SCHA | Undisclosed |
| 22 Aug 18 | R. Zulj Robert Zulj | TSG HoffenheimHOF | → |  1. FC Union BerlinFCU | Loan |
| 22 Aug 18 | V. Osimhen Victor Osimhen |  VfL WolfsburgWOB | → |  Royal Charleroi SCCHA | Loan |
| 20 Aug 18 | F. Kostic Filip Kostic |  Hamburg SVHSV | → | Eintracht FrankfurtSGE | Loan |
| 19 Aug 18 | M. Grujic Marko Grujic |  LiverpoolLIV | → |  Hertha BerlinHERT | Loan |
| 19 Aug 18 | M. Grujic Marko Grujic | LiverpoolLIV | → | Hertha BerlinHERT | Loan |
| 19 Aug 18 | Y. Kubo Yuya Kubo |  KAA GentGENT | → |  NurnbergNUR | Loan |
| 17 Aug 18 | H. Mendyl Hamza Mendyl |  LilleLILL | → | Schalke 04SCHA | Undisclosed |
| 17 Aug 18 | J. Kinjo Justin Toshiki Kinjo |  Fortuna DüsseldorfFOR | → | TGXThespakusatsu GunmaThespakusatsu Gunma | Free |
| 17 Aug 18 | H. Mendyl Hamza Mendyl | LilleLILL | → | Schalke 04SCHA | Undisclosed |
| 16 Aug 18 | T. Kehrer Thilo Kehrer | Schalke 04SCHA | → | Paris Saint-Germain PSG | Undisclosed |
| 16 Aug 18 | D. Avdijaj Donis Avdijaj | Schalke 04SCHA | → |  Willem IIWIL | Undisclosed |
| 16 Aug 18 | T. Kehrer Thilo Kehrer | Schalke 04SCHA | → | Paris Saint-Germain PSG | Undisclosed |
| 16 Aug 18 | D. Avdijaj Donis Avdijaj | Schalke 04SCHA | → | Willem IIWIL | Undisclosed |
| 15 Aug 18 | S. Parker Shawn Parker |  FC AugsburgAUG | → |  SpVgg Greuther FurthFUR | Undisclosed |
| 09 Aug 18 | C. Söyüncü Caglar Söyüncü |  SC FreiburgFREI | → |  Leicester CityLEI | Undisclosed |
| 09 Aug 18 | P. Ochs Philipp Ochs | TSG HoffenheimHOF | → |  AaBAaB | Loan |
| 09 Aug 18 | C. Söyüncü Caglar Söyüncü | SC FreiburgFREI | → | Leicester CityLEI | Undisclosed |
| 08 Aug 18 | B. Simakala Ba-Muaka Simakala |  Borussia MonchengladbachMON | → | RKXRoda KerkradeRoda Kerkrade | Undisclosed |
| 08 Aug 18 | O. Mangala Orel Mangala |  VfB StuttgartVFB | → | Hamburg SVHSV | Loan |
| 07 Aug 18 | I. Thelin Isaac Kiese Thelin |  AnderlechtAND | → | Bayer LeverkusenLEV | Loan |
| 07 Aug 18 | T. Rieder Tim Rieder | FC AugsburgAUG | → |  SV Darmstadt 98DRM | Loan |
| 06 Aug 18 | A. Witsel Axel Witsel |  Tianjin QuanjianTIA | → | Borussia DortmundDOR | Undisclosed |
| 06 Aug 18 | A. Vidal Arturo Vidal | Bayern MunichMUN | → | BarcelonaBAR | Undisclosed |
| 06 Aug 18 | A. Martín Aarón Martín |  EspanyolESP | → | MainzMAIN | Loan |
| 06 Aug 18 | J. Roussillon Jérôme Roussillon |  MontpellierMONT | → | VfL WolfsburgWOB | Undisclosed |
| 06 Aug 18 | A. Vidal Arturo Vidal | Bayern MunichMUN | → | BarcelonaBAR | Undisclosed |
| 06 Aug 18 | J. Roussillon Jérôme Roussillon | MontpellierMONT | → | VfL WolfsburgWOB | Undisclosed |
| 06 Aug 18 | A. Martín Aarón Martín | EspanyolESP | → | MainzMAIN | Loan |
| 04 Aug 18 | T. Usami Takashi Usami | FC AugsburgAUG | → | Fortuna DüsseldorfFOR | Loan |
| 03 Aug 18 | C. Ekene Chinedu Ekene | Bayer LeverkusenLEV | → | TSG HoffenheimHOF | Undisclosed |
| 02 Aug 18 | F. Diagne Fallou Diagne | Werder BremenWER | → |  KonyasporKNY | Free |
| 02 Aug 18 | Y. Muto Yoshinori Muto | MainzMAIN | → |  Newcastle UnitedNEW | Undisclosed |
| 02 Aug 18 | Y. Muto Yoshinori Muto | MainzMAIN | → | Newcastle UnitedNEW | Undisclosed |
| 01 Aug 18 | S. Kapino Stefanos Kapino |  Nottingham ForestFOR | → | Werder BremenWER | Undisclosed |
| 01 Aug 18 | I. Touré Idrissa Touré | Werder BremenWER | → |  JuventusJUV | Loan |
| 01 Aug 18 | S. Kapino Stefanos Kapino | Nottingham ForestFOR | → | Werder BremenWER | Undisclosed |
| 01 Aug 18 | I. Touré Idrissa Touré | Werder BremenWER | → | JuventusJUV | Loan |
| 31 Jul 18 | B. Höwedes Benedikt Höwedes | Schalke 04SCHA | → |  Lokomotiv MoscowLMO | Undisclosed |
| 30 Jul 18 | M. Pronichev Maximilian Pronichev | Hertha BerlinHERT | → |  FC Erzgebirge AueERZ | Loan |
| 29 Jul 18 | J. Meffert Jonas Meffert | SC FreiburgFREI | → |  Holstein KielHOL | Undisclosed |
| 29 Jul 18 | C. Pizarro Claudio Pizarro | XXX | → | Werder BremenWER | Free |
| 27 Jul 18 | D. Klaassen Davy Klaassen |  EvertonEVE | → | Werder BremenWER | 12,000,000 |
| 27 Jul 18 | F. Geraldes Francisco Geraldes |  Sporting CPSCP | → | Eintracht FrankfurtSGE | Loan |
| 27 Jul 18 | O. Chico Geraldes Oliveira Chico Geraldes | Sporting CPSCP | → | Eintracht FrankfurtSGE | Loan |
| 27 Jul 18 | P. Klandt Patric Klandt | SC FreiburgFREI | → | NurnbergNUR | Undisclosed |
| 27 Jul 18 | M. Heller Marcel Heller | FC AugsburgAUG | → | SV Darmstadt 98DRM | Undisclosed |
| 27 Jul 18 | D. Klaassen Davy Klaassen | EvertonEVE | → | Werder BremenWER | 12,000,000 |
| 25 Jul 18 | Allan | LiverpoolLIV | → | Eintracht FrankfurtSGE | Loan |
| 25 Jul 18 | B. Tekpetey Bernard Tekpetey | Schalke 04SCHA | → |  SC Paderborn 07PAD | Undisclosed |
| 25 Jul 18 | K. Nuhu Kasim Nuhu |  Young BoysYB | → | TSG HoffenheimHOF | Undisclosed |
| 25 Jul 18 | A. Schürrle André Schürrle | Borussia DortmundDOR | → |  FulhamFUL | Loan |
| 25 Jul 18 | Allan | LiverpoolLIV | → | Eintracht FrankfurtSGE | Loan |
| 25 Jul 18 | A. Schürrle André Schürrle | Borussia DortmundDOR | → | FulhamFUL | Loan |
| 23 Jul 18 | M. Besuschkow Max Besuschkow | Eintracht FrankfurtSGE | → | USXUnion SGUnion SG | Loan |
| 23 Jul 18 | L. Thy Lennart Thy | Werder BremenWER | → |  Erzurum BBERZ | Free |
| 23 Jul 18 | B. Borrello Brandon Borrello | FKX1.FC Kaiserslautern1.FC Kaiserslautern | → | SC FreiburgFREI | Free |
| 22 Jul 18 | D. Lukebakio Dodi Lukebakio |  WatfordWAT | → | Fortuna DüsseldorfFOR | Loan |
| 22 Jul 18 | D. Lukebakio Dodi Lukebakio | WatfordWAT | → | Fortuna DüsseldorfFOR | Loan |
| 20 Jul 18 | P. Insua Pablo Insua | Schalke 04SCHA | → |  HuescaHUE | Loan |
| 19 Jul 18 | G. Niedermeier Georg Niedermeier | SC FreiburgFREI | → |  Melbourne VictoryMVC | Free |
| 19 Jul 18 | G. Niedermeier Georg Niedermeier | SC FreiburgFREI | → | Melbourne VictoryMVC | Free |
| 16 Jul 18 | B. Nazario Bruno Nazario | TSG HoffenheimHOF | → |  Athletico-PRCAP | Loan |
| 16 Jul 18 | B. Nazario Bruno Nazario | TSG HoffenheimHOF | → | Athletico-PRCAP | Loan |
| 16 Jul 18 | E. Iyoha Emmanuel Iyoha | Fortuna DüsseldorfFOR | → | FC Erzgebirge AueERZ | Loan |
| 16 Jul 18 | M. Zimmermann Matthias Zimmermann | VfB StuttgartVFB | → | Fortuna DüsseldorfFOR | Free |
| 14 Jul 18 | V. Sierro Vincent Sierro | SC FreiburgFREI | → |  St GallenFCSG | Loan |
| 14 Jul 18 | E. Abouchabaka Elias Abouchabaka |  RB LeipzigRBL | → | SpVgg Greuther FurthFUR | Loan |
| 13 Jul 18 | A. Pléa Alassane Pléa |  NiceNICE | → | Borussia MonchengladbachMON | Undisclosed |
| 13 Jul 18 | J. Vestergaard Jannik Vestergaard | Borussia MonchengladbachMON | → |  SouthamptonSOU | Undisclosed |
| 13 Jul 18 | E. Durm Erik Durm | Borussia DortmundDOR | → |  Huddersfield TownHUD | Undisclosed |
| 13 Jul 18 | J. Vestergaard Jannik Vestergaard | Borussia MonchengladbachMON | → | SouthamptonSOU | Undisclosed |
| 13 Jul 18 | A. Pléa Alassane Pléa | NiceNICE | → | Borussia MonchengladbachMON | Undisclosed |
| 13 Jul 18 | E. Durm Erik Durm | Borussia DortmundDOR | → | Huddersfield TownHUD | Undisclosed |
| 12 Jul 18 | G. Paciência Gonçalo Paciência |  FC PortoPOR | → | Eintracht FrankfurtSGE | Undisclosed |
| 12 Jul 18 | F. Beiersdorf Felix Beiersdorf | RB LeipzigRBL | → | ZMXZFC MeuselwitzZFC Meuselwitz | Loan |
| 11 Jul 18 | A. Hakimi Achraf Hakimi |  Real MadridMAD | → | Borussia DortmundDOR | Loan |
| 11 Jul 18 | A. Yarmolenko Andriy Yarmolenko | Borussia DortmundDOR | → |  West Ham UnitedWHU | Undisclosed |
| 11 Jul 18 | A. Hakimi Achraf Hakimi | Real MadridMAD | → | Borussia DortmundDOR | Loan |
| 11 Jul 18 | A. Yarmolenko Andriy Yarmolenko | Borussia DortmundDOR | → | West Ham UnitedWHU | Undisclosed |
| 10 Jul 18 | N. González Nicolás González |  Argentinos JuniorsARGJ | → | VfB StuttgartVFB | 8500000 |
| 10 Jul 18 | N. González Nicolás González | Argentinos JuniorsARGJ | → | VfB StuttgartVFB | 8500000 |
| 09 Jul 18 | B. Wood Bobby Wood | Hamburg SVHSV | → | Hannover 96HAN | Loan |
| 07 Jul 18 | M. Niakhate Moussa Niakhate |  MetzMETZ | → | MainzMAIN | Undisclosed |
| 06 Jul 18 | Z. Kalmar Zsolt Kalmar | RB LeipzigRBL | → | DSXDunajska StredaDunajska Streda | Undisclosed |
| 06 Jul 18 | P. Kunde Malong Pierre Kunde Malong |  Atletico MadridATL | → | MainzMAIN | Undisclosed |
| 06 Jul 18 | P. Kunde Malong Pierre Kunde Malong | Atletico MadridATL | → | MainzMAIN | Undisclosed |
| 06 Jul 18 | P. Köhn Philipp Köhn | RB LeipzigRBL | → |  FC SalzburgSLZ | Undisclosed |
| 05 Jul 18 | L. Torró Lucas Torró |  OsasunaOSA | → | Eintracht FrankfurtSGE | Undisclosed |
| 05 Jul 18 | K. Boateng Kevin-Prince Boateng | Eintracht FrankfurtSGE | → |  SassuoloSAS | Undisclosed |
| 05 Jul 18 | Bernardo | RB LeipzigRBL | → |  Brighton & Hove AlbionBHA | Undisclosed |
| 05 Jul 18 | K. Boateng Kevin-Prince Boateng | Eintracht FrankfurtSGE | → | SassuoloSAS | Undisclosed |
| 05 Jul 18 | Bernardo | RB LeipzigRBL | → | Brighton & Hove AlbionBHA | Undisclosed |
| 05 Jul 18 | R. Bauer Robert Bauer | Werder BremenWER | → | NurnbergNUR | Loan |
| 05 Jul 18 | O. Ndicka Obite Ndicka |  AJ AuxerreAUX | → | Eintracht FrankfurtSGE | Undisclosed |
| 04 Jul 18 | J. Beste Jan-Niklas Beste | Borussia DortmundDOR | → | Werder BremenWER | Undisclosed |
| 03 Jul 18 | B. Atik Baris Atik | TSG HoffenheimHOF | → |  Dynamo DresdenSGD | Undisclosed |
| 03 Jul 18 | K. Kodro Kenan Kodro | MainzMAIN | → |  FC CopenhagenCOP | Undisclosed |
| 02 Jul 18 | S. Papastathopoulos Sokratis Papastathopoulos | Borussia DortmundDOR | → | ArsenalARS | Undisclosed |
| 02 Jul 18 | Alex Timossi Andersson | HIXHelsingborgs IFHelsingborgs IF | → | Bayern MunichMUN | Undisclosed |
| 02 Jul 18 | S. Papastathopoulos Sokratis Papastathopoulos | Borussia DortmundDOR | → | ArsenalARS | Undisclosed |
| 02 Jul 18 | Coke | Schalke 04SCHA | → |  LevanteLEV | Undisclosed |
| 02 Jul 18 | T. Tillman Timothy Tillman | Bayern MunichMUN | → | NurnbergNUR | Loan |
| 02 Jul 18 | F. Passlack Felix Passlack | Borussia DortmundDOR | → |  Norwich CityNOR | Loan |
| 02 Jul 18 | Coke | Schalke 04SCHA | → | LevanteLEV | Undisclosed |
| 02 Jul 18 | F. Passlack Felix Passlack | Borussia DortmundDOR | → | Norwich CityNOR | Loan |
| 02 Jul 18 | L. Dimata Landry Dimata | VfL WolfsburgWOB | → | AnderlechtAND | Loan |
| 02 Jul 18 | L. Hufnagel Lucas Hufnagel | SC FreiburgFREI | → | UXXUnterhachingUnterhaching | Undisclosed |
| 01 Jul 18 | M. Schmiedebach Manuel Schmiedebach | Hannover 96HAN | → | 1. FC Union BerlinFCU | Loan |
| 01 Jul 18 | M. Sverko Marin Sverko | MainzMAIN | → |  Karlsruher SCKAR | Loan |
| 01 Jul 18 | K. Wimmer Kevin Wimmer |  Stoke CitySTK | → | Hannover 96HAN | Loan |
| 01 Jul 18 | E. Oelschlägel Eric Oelschlägel | Werder BremenWER | → | Borussia DortmundDOR | Free |
| 01 Jul 18 | K. Bennetts Keanan Bennetts |  Tottenham HotspurTOT | → | Borussia MonchengladbachMON | Undisclosed |
| 01 Jul 18 | J. Dilrosun Javairo Dilrosun |  Manchester CityMNC | → | Hertha BerlinHERT | Undisclosed |
| 01 Jul 18 | N. Keita Naby Keita | RB LeipzigRBL | → | LiverpoolLIV | Undisclosed |
| 01 Jul 18 | J. Lössl Jonas Lössl | MainzMAIN | → | Huddersfield TownHUD | Undisclosed |
| 01 Jul 18 | P. Maffeo Pablo Maffeo | Manchester CityMNC | → | VfB StuttgartVFB | Undisclosed |
| 01 Jul 18 | L. Balogun Leon Balogun | MainzMAIN | → | Brighton & Hove AlbionBHA | Free |
| 01 Jul 18 | T. Asano Takuma Asano | ArsenalARS | → | Hannover 96HAN | Loan |
| 01 Jul 18 | B. Rahman Baba Rahman |  ChelseaCHE | → | Schalke 04SCHA | Loan |
| 01 Jul 18 | K. Wimmer Kevin Wimmer | Stoke CitySTK | → | Hannover 96HAN | Loan |
| 01 Jul 18 | P. Lienhart Philipp Lienhart | Real MadridMAD | → | SC FreiburgFREI | Undisclosed |
| 01 Jul 18 | O. Mascarell Omar Mascarell | Real MadridMAD | → | Schalke 04SCHA | Undisclosed |
| 01 Jul 18 | M. Wolf Marius Wolf | Eintracht FrankfurtSGE | → | Borussia DortmundDOR | 5000000 |
| 01 Jul 18 | Paulinho |  Vasco da GamaVAS | → | Bayer LeverkusenLEV | Undisclosed |
| 01 Jul 18 | Walace | Hamburg SVHSV | → | Hannover 96HAN | Undisclosed |
| 01 Jul 18 | F. Beijmo Felix Beijmo |  Djurgardens IFDJU | → | Werder BremenWER | Undisclosed |
| 01 Jul 18 | I. Belfodil Ishak Belfodil |  Standard LiegeSTL | → | TSG HoffenheimHOF | Undisclosed |
| 01 Jul 18 | K. Bennetts Keanan Bennetts | Tottenham HotspurTOT | → | Borussia MonchengladbachMON | Undisclosed |
| 01 Jul 18 | L. Bittencourt Leonardo Bittencourt |  FC CologneCOL | → | TSG HoffenheimHOF | Undisclosed |
| 01 Jul 18 | J. Blaswich Janis Blaswich | Borussia MonchengladbachMON | → |  Heracles AlmeloHER | Undisclosed |
| 01 Jul 18 | R. Bobadilla Raúl Marcelo Bobadilla | Borussia MonchengladbachMON | → | Argentinos JuniorsARGJ | Undisclosed |
| 01 Jul 18 | J. Brenet Joshua Brenet |  PSV EindhovenPSV | → | TSG HoffenheimHOF | Undisclosed |
| 01 Jul 18 | G. Castro Gonzalo Castro | Borussia DortmundDOR | → | VfB StuttgartVFB | Undisclosed |
| 01 Jul 18 | M. Cunha Matheus Cunha |  FC SionSION | → | RB LeipzigRBL | Undisclosed |
| 01 Jul 18 | R. Dadachov Renat Dadachov | Eintracht FrankfurtSGE | → |  EstorilEST | Undisclosed |
| 01 Jul 18 | M. Daehli Mats Daehli | SC FreiburgFREI | → |  St PauliSTP | Undisclosed |
| 01 Jul 18 | T. Delaney Thomas Delaney | Werder BremenWER | → | Borussia DortmundDOR | Undisclosed |
| 01 Jul 18 | A. Diallo Abdou Diallo | MainzMAIN | → | Borussia DortmundDOR | Undisclosed |
| 01 Jul 18 | J. Dilrosun Javairo Dilrosun | Manchester CityMNC | → | Hertha BerlinHERT | Undisclosed |
| 01 Jul 18 | M. Ducksch Marvin Ducksch | St PauliSTP | → | Fortuna DüsseldorfFOR | Undisclosed |
| 01 Jul 18 | M. Flekken Mark Flekken |  MSV DuisburgDUI | → | SC FreiburgFREI | Undisclosed |
| 01 Jul 18 | U. Garcia Ulisses Garcia | Werder BremenWER | → | Young BoysYB | Undisclosed |
| 01 Jul 18 | R. Gikiewicz Rafal Gikiewicz | SC FreiburgFREI | → | 1. FC Union BerlinFCU | Undisclosed |
| 01 Jul 18 | B. Gimber Benedikt Gimber | TSG HoffenheimHOF | → |  FC Ingolstadt 04ING | Undisclosed |
| 01 Jul 18 | D. Ginczek Daniel Ginczek | VfB StuttgartVFB | → | VfL WolfsburgWOB | Undisclosed |
| 01 Jul 18 | J. Gondorf Jerome Gondorf | Werder BremenWER | → | SC FreiburgFREI | Undisclosed |
| 01 Jul 18 | J. Green Julian Green | VfB StuttgartVFB | → | SpVgg Greuther FurthFUR | Undisclosed |
| 01 Jul 18 | V. Grifo Vincenzo Grifo | Borussia MonchengladbachMON | → | TSG HoffenheimHOF | Undisclosed |
| 01 Jul 18 | L. Guwara Leon Guwara | Werder BremenWER | → |  FC UtrechtUTR | Undisclosed |
| 01 Jul 18 | F. Götze Felix Götze | Bayer LeverkusenLEV | → | FC AugsburgAUG | Undisclosed |
| 01 Jul 18 | A. Hahn André Hahn | Hamburg SVHSV | → | FC AugsburgAUG | Undisclosed |
| 01 Jul 18 | K. Haraguchi Kenki Haraguchi | Hertha BerlinHERT | → | Hannover 96HAN | Undisclosed |
| 01 Jul 18 | M. Harnik Martin Harnik | Hannover 96HAN | → | Werder BremenWER | Undisclosed |
| 01 Jul 18 | D. Heintz Dominique Heintz | FC CologneCOL | → | SC FreiburgFREI | Undisclosed |
| 01 Jul 18 | L. Hemmerich Luke Hemmerich | Schalke 04SCHA | → | FC Erzgebirge AueERZ | Undisclosed |
| 01 Jul 18 | F. Hubner Florian Hubner | Hertha BerlinHERT | → | 1. FC Union BerlinFCU | Undisclosed |
| 01 Jul 18 | A. Ignjovski Aleksandar Ignjovski | SC FreiburgFREI | → |  1. FC MagdeburgMAG | Undisclosed |
| 01 Jul 18 | V. Janelt Vitaly Janelt | RB LeipzigRBL | → |  VfL BochumBOC | Undisclosed |
| 01 Jul 18 | F. Jensen Fredrik Jensen |  FC TwenteTWE | → | FC AugsburgAUG | Undisclosed |
| 01 Jul 18 | N. Keita Naby Keita | RB LeipzigRBL | → | LiverpoolLIV | Undisclosed |
| 01 Jul 18 | M. Kempf Marc-Oliver Kempf | SC FreiburgFREI | → | VfB StuttgartVFB | Undisclosed |
| 01 Jul 18 | F. Klaus Felix Klaus | Hannover 96HAN | → | VfL WolfsburgWOB | Undisclosed |
| 01 Jul 18 | L. Kleinheisler Laszlo Kleinheisler | Werder BremenWER | → | FAXFC AstanaFC Astana | Undisclosed |
| 01 Jul 18 | L. Klünter Lukas Klünter | FC CologneCOL | → | Hertha BerlinHERT | Undisclosed |
| 01 Jul 18 | D. Kopacz David Kopacz | Borussia DortmundDOR | → | VfB StuttgartVFB | Undisclosed |
| 01 Jul 18 | P. Köpke Pascal Köpke | FC Erzgebirge AueERZ | → | Hertha BerlinHERT | Undisclosed |
| 01 Jul 18 | M. Lang Michael Lang |  FC BaselBAS | → | Borussia MonchengladbachMON | Undisclosed |
| 01 Jul 18 | P. Lienhart Philipp Lienhart | Real MadridMAD | → | SC FreiburgFREI | Undisclosed |
| 01 Jul 18 | J. Lössl Jonas Lössl | MainzMAIN | → | Huddersfield TownHUD | Undisclosed |
| 01 Jul 18 | P. Maffeo Pablo Maffeo | Manchester CityMNC | → | VfB StuttgartVFB | Undisclosed |
| 01 Jul 18 | O. Mascarell Omar Mascarell | Real MadridMAD | → | Schalke 04SCHA | Undisclosed |
| 01 Jul 18 | R. Massimo Roberto Massimo |  Arminia BielefeldDSC | → | VfB StuttgartVFB | Undisclosed |
| 01 Jul 18 | J. Mateta Jean-Philippe Mateta |  LyonLYON | → | MainzMAIN | Undisclosed |
| 01 Jul 18 | C. Mathenia Christian Mathenia | Hamburg SVHSV | → | NurnbergNUR | Undisclosed |
| 01 Jul 18 | J. Mees Joshua Mees | TSG HoffenheimHOF | → | 1. FC Union BerlinFCU | Undisclosed |
| 01 Jul 18 | N. Mukiele Nordi Mukiele | MontpellierMONT | → | RB LeipzigRBL | Undisclosed |
| 01 Jul 18 | J. Onguene Jerome Onguene | VfB StuttgartVFB | → | FC SalzburgSLZ | Undisclosed |
| 01 Jul 18 | Y. Osako Yuya Osako | FC CologneCOL | → | Werder BremenWER | Undisclosed |
| 01 Jul 18 | P. Pervan Pavao Pervan |  LASK LinzLAS | → | VfL WolfsburgWOB | Undisclosed |
| 01 Jul 18 | A. Poulsen Andreas Poulsen |  FC MidtjyllandMIDT | → | Borussia MonchengladbachMON | Undisclosed |
| 01 Jul 18 | M. Ritter Marlon Ritter | Fortuna DüsseldorfFOR | → | SC Paderborn 07PAD | Undisclosed |
| 01 Jul 18 | F. Ronnow Frederik Ronnow |  BrøndbyBRO | → | Eintracht FrankfurtSGE | Undisclosed |
| 01 Jul 18 | C. Salcedo Carlos Salcedo |  GuadalajaraGDL | → | Eintracht FrankfurtSGE | Undisclosed |
| 01 Jul 18 | S. Sané Salif Sané | Hannover 96HAN | → | Schalke 04SCHA | Undisclosed |
| 01 Jul 18 | M. Saracchi Marcelo Saracchi |  River PlateCARP | → | RB LeipzigRBL | Undisclosed |
| 01 Jul 18 | J. Schieber Julian Schieber | Hertha BerlinHERT | → | FC AugsburgAUG | Undisclosed |
| 01 Jul 18 | B. Schmitz Benno Schmitz | RB LeipzigRBL | → | FC CologneCOL | Undisclosed |
| 01 Jul 18 | M. Schwäbe Marvin Schwäbe | TSG HoffenheimHOF | → | BrøndbyBRO | Undisclosed |
| 01 Jul 18 | S. Serdar Suat Serdar | MainzMAIN | → | Schalke 04SCHA | Undisclosed |
| 01 Jul 18 | E. Sigthorsson Elmar Sigthorsson | RB LeipzigRBL | → | FC Ingolstadt 04ING | Undisclosed |
| 01 Jul 18 | S. Skrzybski Steven Skrzybski | 1. FC Union BerlinFCU | → | Schalke 04SCHA | Undisclosed |
| 01 Jul 18 | B. Sosa Borna Sosa | DZXDinamo ZagrebDinamo Zagreb | → | VfB StuttgartVFB | Undisclosed |
| 01 Jul 18 | Niclas Thiede | VfL BochumBOC | → | SC FreiburgFREI | Undisclosed |
| 01 Jul 18 | L. Waldschmidt Luca Waldschmidt | Hamburg SVHSV | → | SC FreiburgFREI | Undisclosed |
| 01 Jul 18 | W. Weghorst Wout Weghorst |  AZ AlkmaarAZ | → | VfL WolfsburgWOB | Undisclosed |
| 01 Jul 18 | M. Weiser Mitchell Weiser | Hertha BerlinHERT | → | Bayer LeverkusenLEV | Undisclosed |
| 01 Jul 18 | S. Yatabaré Sambou Yatabaré | Werder BremenWER | → |  AntwerpANT | Undisclosed |
| 01 Jul 18 | L. Balogun Leon Balogun | MainzMAIN | → | Brighton & Hove AlbionBHA | Free |
| 01 Jul 18 | F. Benko Fabian Benko | Bayern MunichMUN | → | LASK LinzLAS | Free |
| 01 Jul 18 | C. Benschop Charlison Benschop | Hannover 96HAN | → | FC Ingolstadt 04ING | Free |
| 01 Jul 18 | L. Bätge Leon Bätge | Eintracht FrankfurtSGE | → | WKXWurzburger KickersWurzburger Kickers | Free |
| 01 Jul 18 | D. Didavi Daniel Didavi | VfL WolfsburgWOB | → | VfB StuttgartVFB | Free |
| 01 Jul 18 | N. Dorsch Niklas Dorsch | Bayern MunichMUN | → |  1. FC HeidenheimFCH | Free |
| 01 Jul 18 | J. Eilers Justin Eilers | Werder BremenWER | → |  Apollon SmyrniSMY | Free |
| 01 Jul 18 | Ioannis Gelios | FC AugsburgAUG | → | HRXHansa RostockHansa Rostock | Free |
| 01 Jul 18 | K. Goden Kevin Goden | FC CologneCOL | → | NurnbergNUR | Free |
| 01 Jul 18 | L. Goretzka Leon Goretzka | Schalke 04SCHA | → | Bayern MunichMUN | Free |
| 01 Jul 18 | M. Hitz Marwin Hitz | FC AugsburgAUG | → | Borussia DortmundDOR | Free |
| 01 Jul 18 | L. Hradecky Lukas Hradecky | Eintracht FrankfurtSGE | → | Bayer LeverkusenLEV | Free |
| 01 Jul 18 | E. Huth Elias Huth | Hannover 96HAN | → |  KaiserslauternFCK | Free |
| 01 Jul 18 | Z. Junuzovic Zlatko Junuzovic | Werder BremenWER | → | FC SalzburgSLZ | Free |
| 01 Jul 18 | K. Karaman Kenan Karaman | Hannover 96HAN | → | Fortuna DüsseldorfFOR | Free |
| 01 Jul 18 | T. Kirschbaum Thorsten Kirschbaum | NurnbergNUR | → | Bayer LeverkusenLEV | Free |
| 01 Jul 18 | T. Knöll Törles Knöll | Hamburg SVHSV | → | NurnbergNUR | Free |
| 01 Jul 18 | S. Maier Sebastian Maier | Hannover 96HAN | → | VfL BochumBOC | Free |
| 01 Jul 18 | P. Mwene Philip Mwene | KaiserslauternFCK | → | MainzMAIN | Free |
| 01 Jul 18 | K. Möhwald Kevin Möhwald | NurnbergNUR | → | Werder BremenWER | Free |
| 01 Jul 18 | N. Müller Nicolai Müller | Hamburg SVHSV | → | Eintracht FrankfurtSGE | Free |
| 01 Jul 18 | T. Müsel Torben Müsel | KaiserslauternFCK | → | Borussia MonchengladbachMON | Free |
| 01 Jul 18 | D. Reimann Dominik Reimann | Borussia DortmundDOR | → | Holstein KielHOL | Free |
| 01 Jul 18 | M. Uth Mark Uth | TSG HoffenheimHOF | → | Schalke 04SCHA | Free |
| 01 Jul 18 | L. Weinkauf Leo Weinkauf | Bayern MunichMUN | → | Hannover 96HAN | Free |
| 01 Jul 18 | J. Zimmer Jean Zimmer | VfB StuttgartVFB | → | Fortuna DüsseldorfFOR | Free |
| 01 Jul 18 | Ailton | VfB StuttgartVFB | → |  BragaBRAG | Loan |
| 01 Jul 18 | Jonathas | Hannover 96HAN | → |  CorinthiansCOR | Loan |
| 01 Jul 18 | T. Asano Takuma Asano | ArsenalARS | → | Hannover 96HAN | Loan |
| 01 Jul 18 | M. Drager Mohamed Drager | SC FreiburgFREI | → | SC Paderborn 07PAD | Loan |
| 01 Jul 18 | J. Föhrenbach Jonas Föhrenbach | SC FreiburgFREI | → |  SSV Jahn RegensburgJAHN | Loan |
| 01 Jul 18 | N. Körber Nils-Jonathan Körber | Hertha BerlinHERT | → | VOXVfL OsnabruckVfL Osnabruck | Loan |
| 01 Jul 18 | N. Lomb Niklas Lomb | Bayer LeverkusenLEV | → |  SV SandhausenSVS | Loan |
| 01 Jul 18 | R. Massimo Roberto Massimo | VfB StuttgartVFB | → | Arminia BielefeldDSC | Loan |
| 01 Jul 18 | B. Rahman Baba Rahman | ChelseaCHE | → | Schalke 04SCHA | Loan |
| 01 Jul 18 | F. Schleusener Fabian Schleusener | SC FreiburgFREI | → | SV SandhausenSVS | Loan |
| 01 Jul 18 | J. Mateta Jean-Philippe Mateta | LyonLYON | → | MainzMAIN | Undisclosed |
| 01 Jul 18 | N. Mukiele Nordi Mukiele | MontpellierMONT | → | RB LeipzigRBL | Undisclosed |
| 01 Jul 18 | D. Contento Diego Contento |  BordeauxBOR | → | Fortuna DüsseldorfFOR | Free |
| 01 Jul 18 | C. Salcedo Carlos Salcedo | GuadalajaraGDL | → | Eintracht FrankfurtSGE | Undisclosed |
| 01 Jul 18 | J. Blaswich Janis Blaswich | Borussia MonchengladbachMON | → | Heracles AlmeloHER | Undisclosed |
| 01 Jul 18 | J. Brenet Joshua Brenet | PSV EindhovenPSV | → | TSG HoffenheimHOF | Undisclosed |
| 01 Jul 18 | L. Guwara Leon Guwara | Werder BremenWER | → | FC UtrechtUTR | Undisclosed |
| 01 Jul 18 | W. Weghorst Wout Weghorst | AZ AlkmaarAZ | → | VfL WolfsburgWOB | Undisclosed |
| 01 Jul 18 | R. Bobadilla Raúl Marcelo Bobadilla | Borussia MonchengladbachMON | → | Argentinos JuniorsARGJ | Undisclosed |
| 01 Jul 18 | M. Saracchi Marcelo Saracchi | River PlateCARP | → | RB LeipzigRBL | Undisclosed |
| 01 Jul 18 | Paulinho | Vasco da GamaVAS | → | Bayer LeverkusenLEV | Undisclosed |
| 01 Jul 18 | Jonathas | Hannover 96HAN | → | CorinthiansCOR | Loan |
| 26 Jun 18 | M. Leitner Moritz Leitner | FC AugsburgAUG | → | Norwich CityNOR | Undisclosed |
| 26 Jun 18 | M. Leitner Moritz Leitner | FC AugsburgAUG | → | Norwich CityNOR | Undisclosed |
| 19 Jun 18 | B. Leno Bernd Leno | Bayer LeverkusenLEV | → | ArsenalARS | Undisclosed |
| 19 Jun 18 | F. Wiedwald Felix Wiedwald |  Leeds UnitedLEE | → | Eintracht FrankfurtSGE | Undisclosed |
| 19 Jun 18 | B. Leno Bernd Leno | Bayer LeverkusenLEV | → | ArsenalARS | Undisclosed |
| 19 Jun 18 | F. Wiedwald Felix Wiedwald | Leeds UnitedLEE | → | Eintracht FrankfurtSGE | Undisclosed |
| 12 Jun 18 | T. Poppler Isherwood Thomas Poppler Isherwood | Bayern MunichMUN | → |  Bradford CityBRD | Free |
| 11 Jun 18 | V. Grifo Vincenzo Grifo | Borussia MonchengladbachMON | → | TSG HoffenheimHOF | Undisclosed |
| 11 Jun 18 | P. Köpke Pascal Köpke | FC Erzgebirge AueERZ | → | Hertha BerlinHERT | Undisclosed |
| 11 Jun 18 | T. Müsel Torben Müsel | KaiserslauternFCK | → | Borussia MonchengladbachMON | Undisclosed |
| 08 Jun 18 | C. Theoharous Christian Theoharous | Melbourne VictoryMVC | → | Borussia MonchengladbachMON | Undisclosed |
| 08 Jun 18 | D. Contento Diego Contento | BordeauxBOR | → | Fortuna DüsseldorfFOR | Free |
| 08 Jun 18 | D. Costa Douglas Costa | Bayern MunichMUN | → | JuventusJUV | 40000000 |
| 08 Jun 18 | D. Costa Douglas Costa | Bayern MunichMUN | → | JuventusJUV | 40000000 |
| 08 Jun 18 | J. Gondorf Jerome Gondorf | Werder BremenWER | → | SC FreiburgFREI | Undisclosed |
| 08 Jun 18 | C. Theoharous Christian Theoharous | Melbourne VictoryMVC | → | Borussia MonchengladbachMON | Undisclosed |
| 07 Jun 18 | T. Delaney Thomas Delaney | Werder BremenWER | → | Borussia DortmundDOR | Undisclosed |
| 23 May 18 | J. Schieber Julian Schieber | FC AugsburgAUG | → | Hertha BerlinHERT | Free |
| 18 May 18 | S. Serdar Suat Serdar | MainzMAIN | → | Schalke 04SCHA | Undisclosed |
| 14 May 18 | R. Massimo Roberto Massimo | Arminia BielefeldDSC | → | VfB StuttgartVFB | Undisclosed |
| 20 Feb 18 | J. Sargent Joshua Sargent | SLSSt. Louis Scott GallagherSt. Louis Scott Gallagher | → | Werder BremenWER | Undisclosed |
| 31 Jan 18 | M. Rashica Milot Rashica |  VitesseVIT | → | Werder BremenWER | Undisclosed |
| 31 Jan 18 | R. Oxford Reece Oxford | West Ham UnitedWHU | → | Borussia MonchengladbachMON | Loan |
| 31 Jan 18 | A. Lookman Ademola Lookman | EvertonEVE | → | RB LeipzigRBL | Loan |
| 31 Jan 18 | J. Huth Jannik Huth | MainzMAIN | → |  Sparta RotterdamSPA | Loan |
| 31 Jan 18 | K. Hinds Kaylen Hinds | VfL WolfsburgWOB | → | SpVgg Greuther FurthFUR | Loan |
| 31 Jan 18 | M. Besuschkow Max Besuschkow | Eintracht FrankfurtSGE | → | Holstein KielHOL | Loan |
| 31 Jan 18 | M. Bech Manich Bech | Hannover 96HAN | → | SpVgg Greuther FurthFUR | Loan |
| 31 Jan 18 | M. Batshuayi Michy Batshuayi | ChelseaCHE | → | Borussia DortmundDOR | Loan |
| 31 Jan 18 | I. Hajrovic Izet Hajrovic | Werder BremenWER | → | DZXDinamo ZagrebDinamo Zagreb | Free |
| 31 Jan 18 | A. Mehmedi Admir Mehmedi | Bayer LeverkusenLEV | → | VfL WolfsburgWOB | Undisclosed |
| 31 Jan 18 | S. Langkamp Sebastian Langkamp | Hertha BerlinHERT | → | Werder BremenWER | Undisclosed |
| 31 Jan 18 | V. Fischer Viktor Fischer | MainzMAIN | → | FC CopenhagenCOP | Undisclosed |
| 31 Jan 18 | P. Aubameyang Pierre-Emerick Aubameyang | Borussia DortmundDOR | → | ArsenalARS | 56000000 |
| 31 Jan 18 | P. Aubameyang Pierre-Emerick Aubameyang | Borussia DortmundDOR | → | ArsenalARS | 56000000 |
| 31 Jan 18 | R. Oxford Reece Oxford | West Ham UnitedWHU | → | Borussia MonchengladbachMON | Loan |
| 31 Jan 18 | A. Lookman Ademola Lookman | EvertonEVE | → | RB LeipzigRBL | Loan |
| 31 Jan 18 | M. Batshuayi Michy Batshuayi | ChelseaCHE | → | Borussia DortmundDOR | Loan |
| 31 Jan 18 | M. Rashica Milot Rashica | VitesseVIT | → | Werder BremenWER | Undisclosed |
| 31 Jan 18 | J. Huth Jannik Huth | MainzMAIN | → | Sparta RotterdamSPA | Loan |
| 30 Jan 18 | S. Gómez Sergio Gómez | BarcelonaBAR | → | Borussia DortmundDOR | Undisclosed |
| 30 Jan 18 | P. Kammerbauer Patrick Kammerbauer | NurnbergNUR | → | SC FreiburgFREI | Undisclosed |
| 30 Jan 18 | S. Gómez Sergio Gómez | BarcelonaBAR | → | Borussia DortmundDOR | Undisclosed |
| 30 Jan 18 | M. Bartra Marc Bartra | Borussia DortmundDOR | → |  Real BetisBET | Undisclosed |
| 30 Jan 18 | M. Bartra Marc Bartra | Borussia DortmundDOR | → | Real BetisBET | Undisclosed |
| 29 Jan 18 | B. Rahman Baba Rahman | ChelseaCHE | → | Schalke 04SCHA | Loan |
| 29 Jan 18 | B. Rahman Baba Rahman | ChelseaCHE | → | Schalke 04SCHA | Loan |
| 29 Jan 18 | G. Bussmann Gaëtan Bussmann | MainzMAIN | → | SC FreiburgFREI | Loan |
| 27 Jan 18 | M. Friedrich Marvin Friedrich | FC AugsburgAUG | → | 1. FC Union BerlinFCU | Undisclosed |
| 26 Jan 18 | J. Bruun Larsen Jacob Bruun Larsen | Borussia DortmundDOR | → | VfB StuttgartVFB | Loan |
| 26 Jan 18 | O. Bulut Onur Bulut | SC FreiburgFREI | → |  TSV Eintracht BraunschweigEBS | Undisclosed |
| 26 Jan 18 | J. Dong-Won Ji Dong-Won | FC AugsburgAUG | → | SV Darmstadt 98DRM | Loan |
| 25 Jan 18 | M. Leitner Moritz Leitner | FC AugsburgAUG | → | Norwich CityNOR | Loan |
| 25 Jan 18 | Ailton | VfB StuttgartVFB | → | EstorilEST | Loan |
| 25 Jan 18 | N. Subotic Neven Subotic | Borussia DortmundDOR | → |  Saint-EtienneASSE | Undisclosed |
| 25 Jan 18 | N. Subotic Neven Subotic | Borussia DortmundDOR | → | Saint-EtienneASSE | Undisclosed |
| 25 Jan 18 | M. Leitner Moritz Leitner | FC AugsburgAUG | → | Norwich CityNOR | Loan |
| 25 Jan 18 | K. Brunker Kai Brunker | SC FreiburgFREI | → | Bradford CityBRD | Undisclosed |
| 25 Jan 18 | M. Friedl Marco Friedl | Bayern MunichMUN | → | Werder BremenWER | Loan |
| 23 Jan 18 | M. Bähre Mike-Steven Bähre | Hannover 96HAN | → | SMXSV MeppenSV Meppen | Loan |
| 23 Jan 18 | K. Yeboah Kwame Yeboah | Borussia MonchengladbachMON | → | PXXPaderbornPaderborn | Loan |
| 18 Jan 18 | P. Ntep Paul-Georges Ntep | VfL WolfsburgWOB | → | Saint-EtienneASSE | Loan |
| 18 Jan 18 | K. Stafylidis Konstantinos Stafylidis | FC AugsburgAUG | → | Stoke CitySTK | Loan |
| 18 Jan 18 | K. Stafylidis Konstantinos Stafylidis | FC AugsburgAUG | → | Stoke CitySTK | Loan |
| 18 Jan 18 | P. Ntep Paul-Georges Ntep | VfL WolfsburgWOB | → | Saint-EtienneASSE | Loan |
| 18 Jan 18 | J. Callsen-Bracker Jan-Ingwer Callsen-Bracker | FC AugsburgAUG | → | KaiserslauternFCK | Loan |
| 18 Jan 18 | E. Thommy Erik Thommy | FC AugsburgAUG | → | VfB StuttgartVFB | Undisclosed |
| 15 Jan 18 | M. Akanji Manuel Akanji | FC BaselBAS | → | Borussia DortmundDOR | Undisclosed |
| 13 Jan 18 | T. Rieder Tim Rieder | FC AugsburgAUG | → | SWXSlask WroclawSlask Wroclaw | Loan |
| 12 Jan 18 | M. Stefaniak Marvin Stefaniak | VfL WolfsburgWOB | → | NurnbergNUR | Loan |
| 11 Jan 18 | A. Grgic Anto Grgic | VfB StuttgartVFB | → | FC SionSION | Loan |
| 10 Jan 18 | V. Stocker Valentin Stocker | Hertha BerlinHERT | → | FC BaselBAS | Free |
| 10 Jan 18 | R. Steffen Renato Steffen | FC BaselBAS | → | VfL WolfsburgWOB | Undisclosed |
| 10 Jan 18 | B. Atik Baris Atik | TSG HoffenheimHOF | → | SV Darmstadt 98DRM | Loan |
| 08 Jan 18 | F. Palacios-Martinez Federico Palacios-Martinez | RB LeipzigRBL | → | NurnbergNUR | Undisclosed |
| 08 Jan 18 | J. Elez Josip Elez | HRXHNK RijekaHNK Rijeka | → | Hannover 96HAN | Loan |
| 08 Jan 18 | A. Colak Antonio-Mirko Colak | TSG HoffenheimHOF | → | HRXHNK RijekaHNK Rijeka | Loan |
| 05 Jan 18 | N. de Jong Nigel de Jong |  GalatasarayGAL | → | MainzMAIN | Free |
| 05 Jan 18 | P. Ochs Philipp Ochs | TSG HoffenheimHOF | → | VfL BochumBOC | Loan |
| 05 Jan 18 | U. Garcia Ulisses Garcia | Werder BremenWER | → | NurnbergNUR | Loan |
| 04 Jan 18 | M. Pjaca Marko Pjaca | JuventusJUV | → | Schalke 04SCHA | Loan |
| 04 Jan 18 | M. Pjaca Marko Pjaca | JuventusJUV | → | Schalke 04SCHA | Loan |
| 03 Jan 18 | G. Teigl Georg Teigl | FC AugsburgAUG | → | TSV Eintracht BraunschweigEBS | Loan |
| 03 Jan 18 | C. Teuchert Cedric Teuchert | NurnbergNUR | → | Schalke 04SCHA | Undisclosed |
| 01 Jan 18 | M. Compper Marvin Compper | RB LeipzigRBL | → |  CelticCEL | Undisclosed |
| 01 Jan 18 | M. Merino Mikel Merino | Borussia DortmundDOR | → | Newcastle UnitedNEW | Undisclosed |
| 01 Jan 18 | Coke | Schalke 04SCHA | → | LevanteLEV | Loan |
| 01 Jan 18 | A. Ramalho André Ramalho | Bayer LeverkusenLEV | → | FC SalzburgSLZ | Undisclosed |
| 01 Jan 18 | J. Samperio Jairo Samperio | MainzMAIN | → |  Las PalmasLPA | Undisclosed |
| 01 Jan 18 | S. Terodde Simon Terodde | VfB StuttgartVFB | → | FC CologneCOL | Undisclosed |
| 01 Jan 18 | A. Ujah Anthony Ujah |  Liaoning WhowinLIAO | → | MainzMAIN | Undisclosed |
| 01 Jan 18 | J. Samperio Jairo Samperio | MainzMAIN | → | Las PalmasLPA | Undisclosed |
| 01 Jan 18 | S. Wagner Sandro Wagner | TSG HoffenheimHOF | → | Bayern MunichMUN | Undisclosed |
| 01 Jan 18 | Coke | Schalke 04SCHA | → | LevanteLEV | Loan |
| 01 Jan 18 | A. Ordóñez Anderson Ordóñez | Eintracht FrankfurtSGE | → |  Liga de QuitoLDU | Loan |
| 01 Jan 18 | L. Höler Lucas Höler | SV SandhausenSVS | → | SC FreiburgFREI | Undisclosed |
| 01 Jan 18 | M. Merino Mikel Merino | Borussia DortmundDOR | → | Newcastle UnitedNEW | Undisclosed |
| 01 Jan 18 | M. Gómez Mario Gómez | VfL WolfsburgWOB | → | VfB StuttgartVFB | Undisclosed |
| 01 Jan 18 | F. Frei Fabian Frei | MainzMAIN | → | FC BaselBAS | Undisclosed |
| 01 Jan 18 | M. Compper Marvin Compper | RB LeipzigRBL | → | CelticCEL | Undisclosed |