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| Transfers |
 Celtic < >  Lille |
| VXI | > | Raphael Dias Belloli, RAPHINHA | W | BRA | 67 | 94 | 14/12/96 (28) | 91 | 1.76 | 67 | Lille | 6.93 | 35760 | | | | 2 | 1 | 6245 | 14 | +4 | |
| XKC | < | Christopher NKUNKU | AM/WS | FRA | 65 | 99 | 14/11/97 (27) | 87 | 1.78 | 68 | Celtic | 6.91 | 21200 | | | | 11 | 1 | 5000 | 38 | +1 | |
| RIH | < | Xaver SCHLAGER | CM | AUT | 65 | 91 | 28/09/97 (27) | 87 | 1.84 | 73 | Celtic | 6.66 | 21000 | | | | 10 | 1 | 5000 | 1 | +1 | |
| MMI | < | Luka SUCIC | CM/AM | CRO | 62 | 92 | 08/09/02 (22) | 89 | 1.85 | 69 | Celtic | | 12760 | | | | 0 | 0 | 4830 | 0 | +1 | |
 Juventus < > 5,390,000  Sporting |
| IZL | < | Lesley UGOCHUKWU | CM/CB | FRA | 61 | 93 | 26/03/04 (20) | 82 | | | Juventus | | 5400 | | | | 0 | 0 | 5045 | 0 | Y | |
 Willem II 3,500,000 < >  Kaiserslautern |
| SFW | > | Benjamin HENRICHS | RWB/RM | GER | 66 | 91 | 23/02/97 (28) | 89 | 1.81 | 77 | Kaiserslautern | | 28720 | | | | 0 | 0 | 3670 | 0 | +3 | |
| QEK | < | Daniel MALDINI | AM/W | ITA | 60 | 12 | 11/10/01 (23) | 90 | | | Willem II | | | | | | | | 3245 | | | |
 Ipswich Town < > 6,590,000 Benfica |
| UYA | < | Evan FERGUSON | St | IRL | 62 | 13 | 19/10/04 (20) | 91 | | | Ipswich Town | | | | | | | | 6795 | | | |
| 1,800,000 < > Bayern München |
| ASK | > | Vitor Eduardo da Silva Matos, VITÃO | CB/RB | BRA | 62 | 73 | 02/02/00 (25) | 82 | 1.85 | 65 | Bayern München | | 11860 | | | | 0 | 0 | 2480 | 0 | +1 | |
| 2,000,000 < > Bayern München |
| MUY | > | Ismaël GHARBI Álvarez | AM/CM | ESP | 58 | 99 | 10/04/04 (20) | 93 | 1.73 | 67 | Bayern München | | 6470 | | | | 0 | 0 | 3275 | 0 | +1 | |
Lecce 4,030,000 < >  AIK |
| MMY | > | Pontus ALMQVIST | W | SWE | 61 | 97 | 10/07/99 (25) | 92 | 1.78 | 67 | AIK | | 9500 | | | | 0 | 0 | 3150 | 0 | +1 | |
| Released |
| HNX | 16 | Samuel ILING-JUNIOR | LW | ENG | 59 | 0 | 04/10/03 (21) | 80 | | | Birmingham City | | | | | | | | 3455 | | | |
