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| Player (age) | From club | To club | Date | Fee | |||
|---|---|---|---|---|---|---|---|
| Show/hide all additional info | Fees in euro (EUR) | ||||||
| 1 |  |  M. Balenziaga (20) |  Real Sociedad B |  Bilbao Athletic | 2008, Aug | 1 000 000 | |
| 2 | | J. Areso (18) |  CA Osasuna Juvenil A | Bilbao Athletic | 2017, Jul | 450 000 | |
| 3 | | J. Areso (18) | CA Osasuna Juvenil A | Bilbao Athletic | 2017, Jul | 450 000 | |
| 4 | | I. Martínez (21) |  Alavés | Bilbao Athletic | 2010, Jul | 200 000 | |
| 5 | | U. Gómez (19) | Bilbao Athletic | 2022, Jul | |||
| 6 | | A. Ares (20) | Bilbao Athletic | 2022, Jan | |||
| 7 | | A. Paredes (20) | Bilbao Athletic | 2020, Aug | |||
| 8 | | N. Serrano (17) | Athletic Bilbao Juvenil A | Bilbao Athletic | 2020, Jul | ||
| 9 | | B. Prados (19) | Bilbao Athletic | 2020, Jul | |||
| 10 | | J. Agirrezabala (19) | Bilbao Athletic | 2020, Jul | |||