Additions
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 07/2020 |  | Unai Pérez | GK |  | Athletic Club U19 | Bilbao U19 |
| 07/2020 | | Ander Lorente | DF |  | Athletic Club B | Bilbao B |
| 07/2020 | | Asier Grande | DF |
Departures
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 10/2020 | | Gorka Agirre | MF | | Athletic Club B | Bilbao B |
| 10/2020 | | Jon Guruzeta | MF | | Athletic Club B | Bilbao B |
| 08/2020 | | Rudi | MF |  | CD Tudelano | CD Tudelano |
| 07/2020 |  | Yussi Diarra | MF | | Athletic Club B | Bilbao B |
| 07/2020 | | Gorka Estrada | MF |  | Arenas de Getxo | Arenas de Getxo |
| 07/2020 | | Josu Juste | FW |  | Sestao River | Sestao River |