| 06 Sept 17 | T. Kolodziejczak Timothée Kolodziejczak |  Borussia MonchengladbachMON | → |  Tigres UANLUANL | Undisclosed |
| 06 Sept 17 | T. Kolodziejczak Timothée Kolodziejczak | Borussia MonchengladbachMON | → | Tigres UANLUANL | Undisclosed |
| 17 Aug 17 | R. Bobadilla Raúl Marcelo Bobadilla |  FC AugsburgAUG | → | Borussia MonchengladbachMON | Undisclosed |
| 28 Jul 17 | C. Heimeroth Christofer Heimeroth | Borussia MonchengladbachMON | → |  Hannover 96HAN | Free |
| 27 Jul 17 | T. Ndenge Tsiy William Ndenge | Borussia MonchengladbachMON | → |  Roda JC KerkradeRJC | — |
| 27 Jul 17 | T. Ndenge Tsiy William Ndenge | Borussia MonchengladbachMON | → | Roda JC KerkradeRJC | — |
| 10 Jul 17 | M. Schulz Marvin Schulz | Borussia MonchengladbachMON | → |  FC LuzernFCL | Undisclosed |
| 08 Jul 17 | N. Schulz Nico Schulz | Borussia MonchengladbachMON | → |  TSG HoffenheimHOF | Undisclosed |
| 04 Jul 17 | M. Ginter Matthias Ginter |  Borussia DortmundDOR | → | Borussia MonchengladbachMON | Undisclosed |
| 01 Jul 17 | R. Oxford Reece Oxford |  West Ham UnitedWHU | → | Borussia MonchengladbachMON | Loan |
| 01 Jul 17 | R. Oxford Reece Oxford | West Ham UnitedWHU | → | Borussia MonchengladbachMON | Loan |
| 01 Jul 17 | F. Neuhaus Florian Neuhaus | Borussia MonchengladbachMON | → |  Fortuna DüsseldorfFOR | Loan |
| 01 Jul 17 | M. Cuisance Michaël Cuisance |  AS Nancy LorraineASNL | → | Borussia MonchengladbachMON | Undisclosed |
| 01 Jul 17 | M. Dahoud Mahmoud Dahoud | Borussia MonchengladbachMON | → | Borussia DortmundDOR | Undisclosed |
| 01 Jul 17 | V. Grifo Vincenzo Grifo |  SC FreiburgFREI | → | Borussia MonchengladbachMON | Undisclosed |
| 01 Jul 17 | A. Hahn André Hahn | Borussia MonchengladbachMON | → |  Hamburg SVHSV | Undisclosed |
| 01 Jul 17 | J. Korb Julian Korb | Borussia MonchengladbachMON | → | Hannover 96HAN | Undisclosed |
| 01 Jul 17 | Djibril Sow | Borussia MonchengladbachMON | → |  Young BoysYB | Undisclosed |
| 01 Jul 17 | D. Zakaria Denis Zakaria | Young BoysYB | → | Borussia MonchengladbachMON | Undisclosed |
| 01 Jul 17 | F. Neuhaus Florian Neuhaus | MXX1860 Munich1860 Munich | → | Borussia MonchengladbachMON | Free |
| 04 Jan 17 | T. Kolodziejczak Timothée Kolodziejczak |  SevillaSEV | → | Borussia MonchengladbachMON | Undisclosed |
| 04 Jan 17 | T. Kolodziejczak Timothée Kolodziejczak | SevillaSEV | → | Borussia MonchengladbachMON | Undisclosed |