Transfers
Recent player movements in and out of the squad
| Date | Player | From | To | Type |
|---|---|---|---|---|
| 05.08.2023 | Unai Vencedor | Athletic Club | — | Loan |
| 25.07.2023 | Juan Artola | Athletic Club | — | Loan |
| 24.07.2023 | Alex Petxarroman | Athletic Club | — | Free |
| 11.07.2023 | Ibon Ispizua | Athletic Club | — | N/A |
| 10.07.2023 | Balenziaga | Athletic Club | — | Free |
| 05.07.2023 | Íñigo Martínez | Athletic Club | Barcelona | Free |
| 03.07.2023 | Ander Iru | Athletic Club | — | Free |
| 01.07.2023 | Nico Serrano | — | Athletic Club | N/A |
| 01.07.2023 | Peru Nolaskoain | — | Athletic Club | N/A |
| 01.07.2023 | Oier Zarraga | Athletic Club | Udinese | Free |
| 01.07.2023 | Beñat Prados | — | Athletic Club | N/A |
| 01.07.2023 | Ruíz de Galarreta | Mallorca | Athletic Club | Free |
| 01.07.2023 | Imanol García de Albéniz | — | Athletic Club | Free |
| 01.07.2023 | Asier Villalibre | Alaves | Athletic Club | N/A |
| 01.07.2023 | Alex Petxarroman | — | Athletic Club | N/A |
| 26.04.2023 | Unai Gómez | — | Athletic Club | N/A |
| 31.01.2023 | Ander Herrera | Paris Saint Germain | Athletic Club | N/A |
| 30.01.2023 | Asier Villalibre | Athletic Club | Alaves | Loan |
| 27.08.2022 | Ander Herrera | Paris Saint Germain | Athletic Club | Loan |
| 26.08.2022 | Peru Nolaskoain | Athletic Club | — | Loan |
| 12.08.2022 | Malcom Adu | — | Athletic Club | N/A |
| 12.08.2022 | Álex Padilla | — | Athletic Club | N/A |
| 11.08.2022 | Nico Serrano | Athletic Club | — | Loan |
| 10.08.2022 | Alex Petxarroman | Athletic Club | — | Loan |
| 22.07.2022 | Iñigo Córdoba | Athletic Club | Fortuna Sittard | Free |
| 20.07.2022 | Unai Núñez | Athletic Club | Celta Vigo | Loan |
| 14.07.2022 | Beñat Prados | Athletic Club | — | Loan |
| 14.07.2022 | Imanol García de Albéniz | Athletic Club | — | Loan |
| 14.07.2022 | Iñigo Vicente | Athletic Club | — | Free |
| 08.07.2022 | Antxón Jaso | Athletic Club | — | N/A |
| 07.07.2022 | Juan Artola | Athletic Club | — | Loan |
| 05.07.2022 | Jokin Ezkieta | Athletic Club | — | N/A |
| 03.07.2022 | Gorka Guruzeta | — | Athletic Club | Free |
| 01.07.2022 | Imanol García de Albéniz | — | Athletic Club | N/A |
| 01.07.2022 | Peru Nolaskoain | — | Athletic Club | N/A |
| 01.07.2022 | Iñigo Córdoba | GO Ahead Eagles | Athletic Club | N/A |
| 01.07.2022 | Jon Morcillo | Valladolid | Athletic Club | N/A |
| 01.07.2022 | Unai López | Athletic Club | Rayo Vallecano | N/A |
| 01.07.2022 | Iñigo Vicente | — | Athletic Club | N/A |
| 10.03.2022 | Ibai Gómez | Athletic Club | — | Free |
| 21.01.2022 | Peru Nolaskoain | Athletic Club | — | Loan |
| 04.01.2022 | Jon Morcillo | Athletic Club | Valladolid | Loan |
| 11.09.2021 | Iago Herrerín | Athletic Club | — | Free |
| 31.08.2021 | Unai López | Athletic Club | Rayo Vallecano | Loan |
| 31.08.2021 | Iñigo Córdoba | Athletic Club | GO Ahead Eagles | Loan |
| 24.08.2021 | K. Kodro | Athletic Club | — | Free |
| 01.07.2021 | Iñigo Vicente | Athletic Club | — | Loan |
| 01.07.2021 | Aitor Seguín | Athletic Club | — | Free |
| 01.07.2021 | K. Kodro | Valladolid | Athletic Club | N/A |
| 01.07.2021 | C. Atangana | Athletic Club | — | Free |