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| Player (age) | From club | To club | Date | Fee | |||
|---|---|---|---|---|---|---|---|
| Show/hide all additional info | Fees in euro (EUR) | ||||||
| 1 |  |  P. Mwene (29) |  PSV |  Mainz | 2023, Aug | 1 000 000 | |
| 2 | |  M. Richter (25) |  Hertha | Mainz | 2023, Aug | 3 000 000 | |
| 3 | | T. Krauß (22) |  RB Leipzig | Mainz | 2023, Jul | 5 000 000 | |
| 4 +info | |  S. van den Berg (21) |  Liverpool | Mainz | 2023, Jul | ||
| 5 +info | | B. Bobzien (20) | Mainz | 2023, Jul | |||
| 6 +info | |  R. Pierre-Gabriel (25) |  Espanyol | Mainz | 2023, Jul | ||
| 7 +info | | M. Papela (22) |  SV Sandhausen | Mainz | 2023, Jul | ||
| 8 +info | | A. Fulgini (26) |  Lens | Mainz | 2023, Jul | ||
| 9 +info | | A. Lucoqui (26) | Mainz | 2023, Jul | |||
| 10 | | D. Batz (32) | Mainz | 2023, Jul | |||