Transfers
Recent player movements in and out of the squad
| Date | Player | From | To | Type |
|---|---|---|---|---|
| 01.07.2021 | Aitor Seguín | Athletic Club | — | Free |
| 01.07.2021 | Iñigo Baqué | Athletic Club | — | N/A |
| 01.07.2021 | C. Atangana | Athletic Club | — | Free |
| 01.07.2021 | Iñigo Vicente | Athletic Club | — | Loan |
| 01.02.2021 | Iñigo Córdoba | Athletic Club | Alaves | Loan |
| 28.01.2021 | K. Kodro | Athletic Club | Valladolid | Loan |
| 01.12.2020 | Beñat | Athletic Club | — | Free |
| 02.10.2020 | Gaizka Larrazabal | Athletic Club | — | Free |
| 02.10.2020 | Álex Berenguer | Torino | Athletic Club | N/A |
| 21.09.2020 | Mikel San José Domínguez | Athletic Club | — | Free |
| 21.09.2020 | Jon Sillero | Athletic Club | — | Loan |
| 01.09.2020 | Gorka Guruzeta | Athletic Club | — | N/A |
| 01.09.2020 | Andoni López | Athletic Club | — | N/A |
| 14.08.2020 | C. Ganea | Athletic Club | Aris Thessalonikis | Free |
| 12.08.2020 | Dani Vivian | Athletic Club | — | Loan |
| 05.08.2020 | Hodei Oleaga | Athletic Club | — | € Free |
| 04.08.2020 | C. Atangana | Athletic Club | — | Loan |
| 04.08.2020 | Iñigo Vicente | — | Athletic Club | N/A |
| 04.08.2020 | Peru Nolaskoain | — | Athletic Club | N/A |
| 01.07.2020 | Hodei Oleaga | — | Athletic Club | N/A |
| 01.07.2020 | C. Ganea | — | Athletic Club | N/A |
| 01.06.2020 | Jefferson Luís | Athletic Club | — | — |
| 24.01.2020 | C. Ganea | Athletic Club | — | Loan |
| 23.01.2020 | Aitor Seguín | Athletic Club | — | Loan |
| 20.01.2020 | C. Atangana | Athletic Club | — | Loan |
| 01.01.2020 | Jefferson Luís | — | Athletic Club | Loan |
| 09.09.2019 | Susaeta | Athletic Club | — | N/A |
| 27.08.2019 | Hodei Oleaga | Athletic Club | — | Loan |
| 13.08.2019 | Xabier Etxeita | Athletic Club | Getafe | Free |
| 12.08.2019 | Antxón Jaso | Athletic Club | — | Loan |
| 10.08.2019 | Peru Nolaskoain | Athletic Club | — | Loan |
| 07.08.2019 | Andoni López | Athletic Club | Elche | Loan |
| 09.07.2019 | Íñigo Muñoz | Athletic Club | — | N/A |
| 08.07.2019 | Iturraspe | Athletic Club | Espanyol | Free |
| 08.07.2019 | Jurgi Oteo | Athletic Club | — | Free |
| 07.07.2019 | Mikel Rico | Athletic Club | — | Free |
| 04.07.2019 | Antxón Jaso | — | Athletic Club | N/A |
| 02.07.2019 | Amorrortu | Athletic Club | — | N/A |
| 02.07.2019 | Gorka Pérez | Athletic Club | — | N/A |
| 01.07.2019 | C. Ganea | — | Athletic Club | N/A |
| 01.07.2019 | Álex Remiro | Athletic Club | Real Sociedad | N/A |
| 01.07.2019 | Xabier Etxeita | — | Athletic Club | N/A |
| 01.07.2019 | Mikel Vesga | Leganes | Athletic Club | N/A |
| 01.07.2019 | Jurgi Oteo | — | Athletic Club | N/A |
| 01.07.2019 | Sabin Merino | Athletic Club | Leganes | Free |
| 01.07.2019 | Jokin Ezkieta | Barcelona | Athletic Club | N/A |
| 13.05.2019 | Unai Etxebarría | Athletic Club | — | Loan |
| 31.01.2019 | K. Kodro | FC Copenhagen | Athletic Club | N/A |
| 20.01.2019 | Xabi Garai | Athletic Club | — | N/A |
| 10.01.2019 | Ibai Gómez | Alaves | Athletic Club | € 4M |