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| Transfers |
 Chonbuk Motors < > 7,640,000  Anderlecht |
| QCE | < | LEE Kang-in | AM/St | KOR | 64 | 14 | 19/02/01 (23) | 93 | 1.73 | 68 | Chonbuk Motors | | | | | | | | 5790 | | | |
 Napoli < > 1,440,000  Sporting |
| BGR | < | KAIKY Fernandes Melo | CB | BRA | 55 | 93 | 12/01/04 (21) | 85 | 1.83 | 76 | Napoli | | 4420 | | | | 1 | 0 | 1305 | 0 | +2 | |
 Birmingham City 11,000,000 < >  Kaiserslautern |
| XMD | > | Jobe BELLINGHAM | CM/AM | ENG | 59 | 71 | 23/09/05 (19) | 90 | | | Kaiserslautern | | 4060 | | | | 0 | 0 | 4115 | 0 | Y | |
| Empoli < > 4,180,000 Benfica |
| HRD | < | Matteo RUGGERI | LWB/LM | ITA | 64 | 14 | 11/07/02 (22) | 85 | | | Empoli | | | | | | | | 4355 | | | |
| 350,000 < > Benfica |
| IBY | > | Bence DARDAI | CM/AM | GER | 39 | 85 | 24/01/06 (19) | 93 | 1.88 | 71 | Benfica | | 190 | | | | 0 | 0 | 190 | 0 | Y | |
| 1,600,000 < > Everton |
| TGJ | > | Oliver Johansen BRAUDE | RB | NOR | 59 | 86 | 21/02/04 (20) | 86 | 1.74 | 60 | Everton | | 7360 | | | | 0 | 0 | 2570 | 0 | | |
1,150,000 < >  FC Utrecht |
| JYC | > | Andries NOPPERT | Gk | NED | 62 | 91 | 07/04/94 (30) | 89 | 2.03 | 94 | FC Utrecht | | 11960 | | | | 0 | 0 | 1850 | 0 | +1 | |
| Loan callbacks |
| PEO | 25+ | Luka TOPALOVIC | AM | SVN | 52 | 95 | 23/02/06 (18) | 81 | | | Rangers | | 1260 | | | | 0 | 0 | 1620 | 0 | Y | |
| WLH | - | Jéremy DOKU | W/AM | BEL | 65 | 98 | 27/05/02 (22) | 90 | 1.71 | 61 | Deportivo | | 19180 | | | | 3 | 0 | 7425 | 1 | +3 | |
| CHV | <20 | Luca NETZ | LB/LM | GER | 62/63 | 95 | 15/05/03 (21) | 78 | 1.80 | 74 | SC Heerenveen | | 15240 | | | | 0 | 0 | 4165 | 0 | +2 | |
| ODT | - | Aaron MALOUDA | W | FRA | 48 | 95 | 30/11/05 (19) | 87 | | | Paris SG | | 710 | | | | 0 | 0 | 825 | 0 | Y | |
