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| Transfers |
 Barnet 7,000,000 < >  Kaiserslautern |
| HTY | > | JOĂO MÁRIO Naval Costa Eduardo | CM/RM | POR | 66 | 68 | 19/01/93 (31) | 92 | 1.76 | 70 | Kaiserslautern | | 27020 | | | | 0 | 0 | 4355 | 1 | +3 | |
| IKO | < | Ben ZOLINSKI | RB | GER | 51 | 15 | 03/05/92 (32) | 98 | 1.80 | 78 | Barnet | | | | | | | | 170 | | | |
| ASG | < | Philipp KLEMENT | CM | GER | 54 | 1 | 09/09/92 (31) | 96 | 1.74 | 69 | Barnet | | | | | | | | 695 | | | |
| NFP | < | Hendrick ZUCK | AM/W | GER | 54 | 1 | 21/07/90 (33) | 96 | 1.76 | 64 | Barnet | | | | | | | | 330 | | | |
| Watford 2,500,000 < > Kaiserslautern |
| ABP | > | Mario GÖTZE | AM/CM | GER | 65 | 87 | 03/06/92 (32) | 92 | 1.76 | 64 | Kaiserslautern | | 19600 | | | | 0 | 0 | 2920 | 0 | +3 | |
| EWR | < | Jordan BEYER | RB/CB | GER | 59 | 12 | 19/05/00 (24) | 95 | 1.87 | 80 | Watford | | | | | | | | 1690 | | | |
1,000,000 < >  Lille |
| KEF | > | Benjamin BRANTLIND | AM | SWE | 41 | 88 | 15/08/08 (15) | 88 | | | Lille | | 260 | | | | 0 | 0 | 410 | 0 | Y | |
 Valladolid < > Deportivo |
| PRO | < | Anssumane Fati, ANSU FATI | W/St | ESP | 63 | 97 | 31/10/02 (21) | 83 | 1.78 | 55 | Deportivo | | 13840 | | | | 3 | 0 | 6145 | 0 | +4 | (t.25, Valladolid) |
| 250,000 < > Deportivo |
| YMX | > | Aaron ANSELMINO | CB | ARG | 41 | 77 | 29/04/05 (19) | 88 | | | Deportivo | | 260 | | | | 0 | 0 | 160 | 0 | Y | |
| Bayern München II 3,595,000 < > FC Schalke 04 |
| IDL | > | Marco FRIEDL | LB/CB | AUT | 63 | 92 | 16/03/98 (26) | 94 | 1.87 | 71 | FC Schalke 04 | | 12140 | | | | 0 | 0 | 2705 | 0 | +1 | |
| Racing Santander 7,810,000 < > Sevilla |
| WTB | > | Youssef EN-NESYRI | CS | MAR | 65 | 71 | 01/06/97 (27) | 90 | 1.88 | 75 | Sevilla | | 20200 | | | | 0 | 0 | 5830 | 2 | +1 | |
| Released |
| WDV | 25+ | Dennis SEIMEN | Gk | GER | 39 | 1 | 01/12/05 (18) | 92 | | | Dover Athletic | | | | | | | | 135 | | | |
| QNC | <20 | MARCELO Antônio Guedes Filho | CB | BRA | 55 | 13 | 20/05/87 (37) | 88 | 1.90 | 79 | (retired) | | | | | | | | F/t | | | |
| KYD | <20 | EGÍDIO de Araújo Pereira Júnior | LB | BRA | 58 | 1 | 16/06/86 (38) | 84 | 1.74 | 71 | Foggia | | | | | | | | F/t | | | |
| Loan callbacks |
| AWP | - | Cesare CASADEI | CM | ITA | 57 | 46 | 10/01/03 (21) | 81 | | | Arsenal | | 4330 | 2 | | | 0 | 0 | 2580 | 0 | +5 | |
