Transfers
Recent player movements in and out of the squad
| Date | Player | From | To | Type |
|---|---|---|---|---|
| 24.01.2020 | C. Ganea | Athletic Club | — | Loan |
| 23.01.2020 | Aitor Seguín | Athletic Club | — | Loan |
| 20.01.2020 | C. Atangana | 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 |
| 02.07.2019 | Amorrortu | Athletic Club | — | N/A |
| 02.07.2019 | Gorka Pérez | Athletic Club | — | N/A |
| 01.07.2019 | Álex Remiro | Athletic Club | Real Sociedad | N/A |
| 01.07.2019 | Sabin Merino | Athletic Club | Leganes | Free |
| 13.05.2019 | Unai Etxebarría | Athletic Club | — | Loan |
| 20.01.2019 | Xabi Garai | Athletic Club | — | N/A |
| 09.01.2019 | C. Ganea | Athletic Club | — | Loan |
| 07.01.2019 | Oier Luengo | Athletic Club | — | Loan |
| 31.08.2018 | Sabin Merino | Athletic Club | Leganes | Loan |
| 30.08.2018 | Andoni Tascón | Athletic Club | — | Loan |
| 08.08.2018 | Kepa | Athletic Club | Chelsea | € 79.5M |
| 03.08.2018 | Óscar Gil | Athletic Club | — | N/A |
| 31.07.2018 | C. Atangana | Athletic Club | — | Loan |
| 31.07.2018 | Urtzi Iriondo | Athletic Club | Union St. Gilloise | N/A |
| 24.07.2018 | Xabier Etxeita | Athletic Club | — | Loan |
| 23.07.2018 | Amorrortu | Athletic Club | — | Loan |
| 21.07.2018 | Dopi | Athletic Club | — | Free |
| 17.07.2018 | Xabi Garai | Athletic Club | — | Loan |
| 16.07.2018 | Jonan Amelibia | Athletic Club | — | N/A |
| 12.07.2018 | Murgoitio | Athletic Club | — | Free |
| 05.07.2018 | Oli Fernández | Athletic Club | — | Free |
| 04.07.2018 | Mikel Vesga | Athletic Club | Leganes | Loan |
| 03.07.2018 | Jon Agirrezabala | Athletic Club | — | Free |
| 01.07.2018 | Ander Mediavilla | Athletic Club | — | N/A |
| 01.07.2018 | Urtzi Urzelai | Athletic Club | — | N/A |
| 01.07.2018 | Enric Saborit | Athletic Club | Maccabi Tel Aviv | N/A |
| 23.02.2018 | Ager Aketxe | Athletic Club | — | Free |
| 31.01.2018 | Asier Villalibre | Athletic Club | — | Loan |
| 30.01.2018 | Aymeric Laporte | Athletic Club | Manchester City | € 65M |
| 20.01.2018 | Eneko Bóveda Altube | Athletic Club | — | N/A |
| 02.09.2017 | Ander Mediavilla | Athletic Club | Oviedo | N/A |
| 30.08.2017 | Gorka Santamaría | Athletic Club | — | N/A |
| 23.08.2017 | Iker Bilbao | Athletic Club | — | € Free |
| 20.08.2017 | Asier Villalibre | Athletic Club | Valladolid | Loan |
| 09.08.2017 | Jon Agirrezabala | Athletic Club | — | Loan |
| 03.08.2017 | Oier Sarriegi | Athletic Club | — | Free |
| 01.08.2017 | Unai López | Athletic Club | Rayo Vallecano | Loan |