| Date | Player | From | To | Amount |
|---|---|---|---|---|
| 31 Aug 17 | Marco Tumminello | ARXROMA | CXXCRO | Loan |
| 29 Aug 17 | Patrik Schick | SXXSAM | ARXROMA | Loan |
| 21 Aug 17 | Juan Iturbe | ARXROMA | TXXTIJ | Loan |
| 21 Aug 17 | Juan Iturbe | ARXROMA | TXXTIJ | Loan |
| 17 Aug 17 | Sadiq Umar | ARXROMA | TXXTOR | Loan |
| 22 Jul 17 | Aleksandar Kolarov | MCXMNC | ARXROMA | 5,000,000 |
| 22 Jul 17 | Aleksandar Kolarov | MCXMNC | ARXROMA | 5,000,000 |
| 20 Jul 17 | Grégoire Defrel | SXXSAS | ARXROMA | Loan |
| 16 Jul 17 | Cengiz Ünder | IBXIBFK | ARXROMA | 13400000 |
| 15 Jul 17 | Federico Fazio | THXTOT | ARXROMA | Undisclosed |
| 15 Jul 17 | Federico Fazio | THXTOT | ARXROMA | Undisclosed |
| 11 Jul 17 | Ervin Zukanovic | ARXROMA | GXXGEN | Loan |
| 10 Jul 17 | Ezequiel Ponce | ARXROMA | LXXLILL | Loan |
| 10 Jul 17 | Ezequiel Ponce | ARXROMA | LXXLILL | Loan |
| 09 Jul 17 | Antonio Rüdiger | ARXROMA | CXXCHE | Undisclosed |
| 09 Jul 17 | Antonio Rüdiger | ARXROMA | CXXCHE | Undisclosed |
| 03 Jul 17 | Maxime Gonalons | LXXLYON | ARXROMA | 5,000,000 |
| 03 Jul 17 | Maxime Gonalons | LXXLYON | ARXROMA | 5,000,000 |
| 01 Jul 17 | Héctor Moreno | PEXPSV | ARXROMA | Undisclosed |
| 01 Jul 17 | Leandro Paredes | ARXROMA | ZSPZEN | 23,000,000 |
| 01 Jul 17 | Rick Karsdorp | FRXFEY | ARXROMA | 14000000 |
| 01 Jul 17 | Lorenzo Pellegrini | SXXSAS | ARXROMA | 10000000 |
| 01 Jul 17 | Héctor Moreno | PEXPSV | ARXROMA | Undisclosed |
| 01 Jul 17 | Mohamed Salah | ARXROMA | LXXLIV | Undisclosed |
| 01 Jul 17 | Seydou Doumbia | ARXROMA | SCXSCP | Loan |
| 01 Jul 17 | Rick Karsdorp | FRXFEY | ARXROMA | 14000000 |
| 01 Jul 17 | Mohamed Salah | ARXROMA | LXXLIV | Undisclosed |
| 30 Jun 17 | Lorenzo Pellegrini | SXXSAS | ARXROMA | 10,000,000 |
| 28 Jan 17 | Clément Grenier | LXXLYON | ARXROMA | Loan |
| 28 Jan 17 | Clément Grenier | LXXLYON | ARXROMA | Loan |
| 04 Jan 17 | Juan Iturbe | ARXROMA | TXXTOR | Loan |
| 04 Jan 17 | Iago Falque | ARXROMA | TXXTOR | Undisclosed |