Additions
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 01/2009 |  | Unai Medina | DF |  | Athletic Club U19 | Bilbao U19 |
| 07/2008 | | Ander Larrucea | DF | | Athletic Club U19 | Bilbao U19 |
| 07/2008 | | Gorka Martínez | DF | | Athletic Club U19 | Bilbao U19 |
| 07/2008 | | Eraso | MF | | Athletic Club U19 | Bilbao U19 |
| 07/2008 | | Seguín | MF |  | Real Sociedad U19 | Real Sociedad U19 |
| 07/2008 | | Arkaitz | FW |  | CA Osasuna U19 | Osasuna U19 |
| 07/2008 | | Josu Santamaría | FW | |||
| 07/2008 | | Aitor Iru | GK-CO |
Departures
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 02/2009 | | Gorka Martínez | DF |  | Amurrio Club | Amurrio Club |
| 07/2008 | | Ariño | DF |  | Barakaldo CF | Barakaldo CF |
| 07/2008 | | Eneko Bóveda | DF |  | Athletic Club B | Bilbao B |
| 07/2008 | | Iturraspe | MF |  | Athletic Club | Athletic |
| 07/2008 | | Julen Goñi | FW | | Athletic Club B | Bilbao B |