Additions
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 07/2009 |  | Gorka Magunazelaia | GK | |||
| 07/2009 | | Jon Altamira | GK |  | SD Gernika | Gernika |
| 07/2009 | | Jon García | DF |  | Athletic Club U19 | Bilbao U19 |
| 07/2009 | | Lombera | DF | |||
| 07/2009 | | Odei | DF | |||
| 07/2009 | | Rocha | DF |  | Real Sociedad U19 | Real Sociedad U19 |
| 07/2009 | | Royo | DF | |||
| 07/2009 | | Dani Suárez | MF | |||
| 07/2009 | | Eraña | MF | | Athletic Club U19 | Bilbao U19 |
| 07/2009 | | Erik Morán | MF | | Athletic Club U19 | Bilbao U19 |
| 07/2009 | | Etxaniz | FW | |||
| 07/2009 | | Yurrebaso | FW |
Departures
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 01/2010 | | Etxaniz | FW |  | Athletic Club B | Bilbao B |
| 07/2009 | | Unai Medina | DF | | Athletic Club B | Bilbao B |
| 07/2009 | | Eraso | MF | | Athletic Club B | Bilbao B |
| 07/2009 | | Seguín | MF | | Athletic Club B | Bilbao B |
| 07/2009 | | Arkaitz | FW | | Athletic Club B | Bilbao B |
| 07/2009 | | Josu Santamaría | FW |  | CF Atlético Ciudad | Atlético Ciudad |