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| Player (age) | From club | To club | Date | Fee | |||
|---|---|---|---|---|---|---|---|
| Show/hide all additional info | Fees in euro (EUR) | ||||||
| 1 |  |  A. Stach (24) |  Mainz |  Hoffenheim | 2023, Sep | 11 000 000 | |
| 2 +info | |  D. Burgzorg (24) | Mainz |  Huddersfield Town | 2023, Aug | ||
| 3 | | A. Hack (29) | Mainz | 2023, Aug | 1 500 000 | ||
| 4 +info | | B. Bobzien (20) | Mainz | 2023, Aug | |||
| 5 | | E. Shabani (20) | Mainz | 2023, Aug | |||
| 6 | |  R. Pierre-Gabriel (25) | Mainz |  Nantes | 2023, Aug | ||
| 7 | | A. Lucoqui (26) | Mainz |  Hertha | 2023, Jul | ||
| 8 +info | | L. Laux (20) | Mainz |  SV Sandhausen | 2023, Jul | ||
| 9 | |  M. Mustapha (22) | Mainz | 2023, Jul | 900 000 | ||
| 10 | |  M. Ingvartsen (27) | Mainz |  FC Nordsjaelland | 2023, Jul | 2 950 000 | |