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| Player (age) | From club | To club | Date | Fee | |||
|---|---|---|---|---|---|---|---|
| Show/hide all additional info | Fees in euro (EUR) | ||||||
| 1 |  |  I. Martínez (26) |  Sociedad |  Athletic Bilbao | 2018, Jan | 32 000 000 | |
| 2 |  | Y. Berchiche (28) |  PSG | Athletic Bilbao | 2018, Jul | 24 000 000 | |
| 3 |  | Á. Berenguer (25) |  Torino | Athletic Bilbao | 2021, Jan | 12 000 000 | |
| 4 |  | R. Ríos (25) |  Betis | Athletic Bilbao | 1997, Jul | 12 000 000 | |
| 5 |  | R. García (29) |  Atlético | Athletic Bilbao | 2015, Aug | 8 000 000 | |
| 6 |  | B. Etxebarria (26) | Betis | Athletic Bilbao | 2013, Jul | 8 000 000 | |
| 7 |  | A. Herrera (21) |  Zaragoza | Athletic Bilbao | 2011, Jul | 7 500 000 | |
| 8 |  | J. Martínez (17) |  Osasuna Pampeluna B | Athletic Bilbao | 2006, Jul | 6 000 000 | |
| 9 | | D. López (24) | Osasuna | Athletic Bilbao | 2007, Jul | 5 800 000 | |
| 10 | | I. Gómez (29) |  Alavés | Athletic Bilbao | 2019, Jan | 4 000 000 | |