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| Transfers |
 AA Gent 8,600,000 < > Anderlecht |
| IGH | > | Malick Martin FOFANA | W | BEL | 62 | 82 | 31/03/05 (19) | 95 | | | Anderlecht | | 6940 | | | | 0 | 0 | 6325 | 0 | Y | |
 Olympiakos < > 3,780,000  Sporting |
| MBK | < | THIERRY Rendall CORREIA | RWB | POR | 63 | 10 | 09/03/99 (25) | 86 | 1.76 | 60 | Olympiakos | | | | | | | | 2865 | | | |
 Austin FC 3,000,000 < >  Kaiserslautern |
| LZW | > | Pierre KALULU Kyatengwa | RB/CB | FRA | 63 | 86 | 05/06/00 (24) | 91 | 1.79 | 69 | Kaiserslautern | | 15640 | | | | 0 | 0 | 3025 | 0 | +3 | |
| KRH | < | Albert GRØNBÆK Erlykke | CM/AM | DEN | 61 | 1 | 23/05/01 (23) | 88 | 1.76 | 63 | Austin FC | | | | | | | | 3755 | | | |
 Graficar 3,500,000 < > Kaiserslautern |
| DVI | > | Andrija MAKSIMOVIC | AM | SRB | 54 | 89 | 05/06/07 (17) | 87 | | | Kaiserslautern | | 1800 | | | | 0 | 0 | 2330 | 0 | Y | |
| Nice < > 3,640,000 Kaiserslautern |
| YMK | < | Christian MAWISSA | CB | FRA | 61 | 8 | 18/04/05 (19) | 84 | 1.80 | 83 | Nice | | | | | | | | 3715 | | | |
 Bournemouth 3,000,000 < > Benfica |
| HCK | > | Jurriën TIMBER | FB/CB | NED | 65 | 78 | 17/06/01 (23) | 89 | 1.79 | 78 | Benfica | | 24300 | | | | 0 | 0 | 4520 | 0 | +4 | |
| NIT | < | Federico GATTI | CB | ITA | 66 | 10 | 24/06/98 (26) | 91 | 1.85 | 78 | Bournemouth | | | | | | | | 4150 | | | |
| EDP | < | PEDRO Antonio PORRO Sauceda | RWB | ESP | 65 | 15 | 13/09/99 (25) | 85 | 1.76 | 71 | Bournemouth | | | | | | | | 3815 | | | |
| 3,750,000 < > FC Schalke 04 |
| DBB | > | Francisco Javier González Pérez, FRAN | Gk | ESP | 45 | 96 | 24/06/05 (19) | 90 | 1.99 | 72 | FC Schalke 04 | | 420 | | | | 0 | 0 | 370 | 0 | Y | |
| Bayer Leverkusen 3,750,000 < > FC Schalke 04 |
| TGG | > | Jeanuël BELOCIAN | CB | FRA | 59 | 96 | 17/02/05 (19) | 90 | 1.86 | 73 | FC Schalke 04 | 6.21 | 7150 | | | | 2 | 1 | 2795 | 0 | +1 | |
| 1,400,000 < > Valencia |
| VDK | < | César TÁRREGA Requeni | CB | ESP | 59 | 98 | 26/02/02 (22) | 95 | 1.94 | 78 | Valencia | | 7620 | | | | 0 | 0 | 2130 | 0 | | |
| 2,000,000 < > Valencia |
| MLU | > | Raúl MORO Prescoli | W | ESP | 59 | 96 | 05/12/02 (22) | 94 | 1.69 | 68 | Valencia | | 7550 | | | | 0 | 0 | 3130 | 0 | | |
| 1,600,000 < > Valencia |
| RFR | > | IKER LOSADA Aragunde | AM | ESP | 58 | 96 | 01/08/01 (23) | 94 | 1.75 | 70 | Valencia | | 5920 | | | | 0 | 0 | 2420 | 0 | | |
1,400,000 < >  Lokomotiv |
| IAD | > | Leon AVDULLAHU | CM | SUI | 56 | 91 | 23/02/04 (20) | 86 | 1.85 | 79 | Lokomotiv | | 4500 | | | | 0 | 0 | 2450 | 0 | | |
| Loan/transfer listed |
| RIH | - | Xaver SCHLAGER | CM | AUT | 65 | 95 | 28/09/97 (27) | 90 | 1.84 | 73 | Lille | 6.66 | 21700 | | | T | 10 | 1 | 5000 | 1 | +3 | |
| Loan callbacks |
| JPE | - | ENDRICK Felipe Moreira de Sousa | St | BRA | 59/61 | 94 | 21/07/06 (18) | 77 | 1.73 | 66 | Paris SG | | 5050 | | | | 0 | 0 | 6910 | 0 | Y | |
