Additions
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 04/2021 |  | Aitor Intxausti | DF | |||
| 04/2021 | | Aitor Mirandona | DF | |||
| 04/2021 | | Sergio López | MF | |||
| 04/2021 | | Unai Arroita | MF | |||
| 04/2021 | | Juan Garcia | FW | |||
| 04/2021 | | Julen Castilla | FW | |||
| 01/2021 | | Unai Marino | GK |  | UA Horta | UA Horta |
| 01/2021 | | Borja Uriarte | GK | |||
| 09/2020 | | Mikel Goiria | GK | |||
| 09/2020 |  | Irazábal | DF | |||
| 08/2020 | | Joseba Orbegozo | DF | |||
| 08/2020 | | Leiza | DF |  | CD Vitoria | CD Vitoria |
| 08/2020 | | Gorka Larrucea | MF | |||
| 08/2020 | | Iker Bilbao | MF | |||
| 08/2020 | | Mikel Álvaro | MF | |||
| 07/2020 | | Asier Etxaburu | MF | |||
| 07/2020 | | Iker Unzueta | FW |  | SCD Durango | Durango |
| 07/2020 | | Koldo Obieta | FW |  | CD Tudelano | CD Tudelano |
| 07/2020 | | Unai Uberuaga | MF | |||
| 02/2020 | | Oier Garai | FW | |||
| 01/2020 | | Julen Azkue | MF | | CD Tudelano | CD Tudelano |
| 08/2019 | | Antxón Jaso | DF |  | Athletic Club B | Bilbao B |
| 08/2019 | | Gabri | FW | |||
| 07/2019 | | Ekaitz Molina | MF | |||
| 07/2019 | | Aldalur | DF |  | Burgos CF | Burgos CF |
| 07/2019 | | Sagastibeltza | DF |  | SD Gernika | Gernika |
| 07/2019 | | Unai Rementería | MF |  | Club Portugalete | Portugalete |
| 07/2019 | | Saizar | GK | | Burgos CF | Burgos CF |
| 07/2019 | | Álvaro Pérez | GK |  | CD Santurtzi | CD Santurtzi |
| 07/2019 | | Mújika | AS-CO | |||
| 07/2019 | | Beñat Garro | DF |  | Real Unión | Real Unión |
| 07/2019 | | Ekain Zenitagoia | MF | | SCD Durango | Durango |
| 07/2019 | | Amorrortu | FW | | SCD Durango | Durango |
| 07/2019 | | Lekué | GK-CO |
Departures
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 01/2021 | | Unai Uberuaga | MF |  | Urduliz FT | Urduliz FT |
| 08/2020 | | Gabri | FW |  | CF Villanovense | Villanovense |
| 08/2020 | | Julen Azkue | MF | | CF Villanovense | Villanovense |
| 07/2020 | | Antxón Jaso | DF | | Athletic Club B | Bilbao B |
| 07/2020 | | Unai Rementería | MF |  | Arenas de Getxo | Arenas de Getxo |
| 07/2020 | | Amorrortu | FW |  | CD Calahorra | CD Calahorra |
| 01/2020 | | Markel Lozano | MF |  | RC Celta B | RC Celta B |
| 08/2019 | | Josu Ibarbia | DF | | Arenas de Getxo | Arenas de Getxo |
| 07/2019 | | Tena | GK |  | UMF Afturelding | UMF Afturelding |
| 07/2019 | | Aurtenetxe | DF |  | Atlético Baleares | CDA Baleares |
| 07/2019 | | Oier Luengo | DF | | Athletic Club B | Bilbao B |
| 07/2019 |  | Matej Šimić | DF |  | Lleida CF | Lleida |
| 07/2019 | | Gorka Iturraspe | MF | | Atlético Baleares | CDA Baleares |
| 07/2019 | | Ander Pacheco | FW | | SD Gernika | Gernika |
| 07/2019 | | Andoni Tascón | FW | | Athletic Club B | Bilbao B |
| 07/2019 | | Soberón | FW |  | Racing Santander | Racing |
| 07/2019 | | Aranzubía | GK-CO |  | Athletic Club | Athletic |