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| Player (age) | From club | To club | Date | Fee | |||
|---|---|---|---|---|---|---|---|
| Show/hide all additional info | Fees in euro (EUR) | ||||||
| 1 |  |  U. Sadiq (25) |  Almería |  Sociedad | 2022, Sep | 20 000 000 | |
| 2 |  |  A. Illarramendi (25) |  Real | Sociedad | 2015, Aug | 15 000 000 | |
| 3 | | B. Méndez (25) |  Celta Vigo | Sociedad | 2022, Jul | 14 000 000 | |
| 4 |  |  C. Vela (23) |  Arsenal | Sociedad | 2012, Aug | 14 000 000 | |
| 5 | |  A. Zakharyan (20) |  Dynamo | Sociedad | 2023, Aug | 13 000 000 | |
| 6 |  | M. Merino (22) |  Newcastle | Sociedad | 2018, Jul | 12 000 000 | |
| 7 | |  M. Cho (18) |  Angers | Sociedad | 2022, Jul | 11 000 000 | |
| 8 | | C. Fernández (24) |  Sevilla | Sociedad | 2021, Jan | 10 000 000 | |
| 9 |  | Portu (27) |  Girona | Sociedad | 2019, Jul | 10 000 000 | |
| 10 | |  A. Januzaj (22) |  Man United | Sociedad | 2017, Jul | 8 500 000 | |