| Name | Age | Position | Nationality |
|---|---|---|---|
| Álex Remiro | 30 | Goalkeeper | Spain |
| Unai Marrero | 23 | Goalkeeper | Spain |
| Egoitz Arana | 23 | Goalkeeper | Spain |
| Aitor Fraga | 22 | Goalkeeper | Spain |
| Javi López | 23 | Defence | Spain |
| Luken Beitia | 20 | Defence | Spain |
| Jon Balda | 23 | Defence | Spain |
| Orri Oskarsson | 20 | Offence | Iceland |
| Arkaitz Mariezkurrena | 20 | Offence | Spain |
| Mikel Goti | 22 | Offence | Spain |
| Alex Marchal | 17 | Offence | Spain |
| Ekain Orobengoa | 20 | Offence | Spain |
| Dani Díaz | 18 | Offence | Spain |
| Beñat Turrientes | 23 | Central Midfield | Spain |
| Jon Pacheco | 24 | Centre-Back | Spain |
| Jon Aramburu | 22 | Right-Back | Venezuela |
| Martín Zubimendi | 26 | Defensive Midfield | Spain |
| Ander Barrenetxea | 23 | Left Winger | Spain |
| Aihen Muñoz | 27 | Left-Back | Spain |
| Luka Sučić | 22 | Central Midfield | Croatia |
| Nayef Aguerd | 29 | Centre-Back | Morocco |
| Takefusa Kubo | 23 | Right Winger | Japan |
| Brais Méndez | 28 | Attacking Midfield | Spain |
| Hamari Traoré | 33 | Right-Back | Mali |
| Sheraldo Becker | 30 | Left Winger | Suriname |
| Sergio Gómez | 24 | Right Winger | Spain |
| Igor Zubeldía | 28 | Centre-Back | Spain |
| Aritz Elustondo | 31 | Centre-Back | Spain |
| Álvaro Odriozola | 29 | Right-Back | Spain |
| Iñaki Rupérez | 22 | Right-Back | Spain |
| Jon Martín | 19 | Centre-Back | Spain |
| Mikel Oyarzabal | 28 | Centre-Forward | Spain |
| Pablo Marin | 21 | Attacking Midfield | Spain |
| Arsen Zakharyan | 21 | Attacking Midfield | Russia |
| Jon Olasagasti | 24 | Central Midfield | Spain |