Additions
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 01/1999 |  | Lombraña | DF |  | Athletic Club B | Bilbao B |
| 07/1998 | | Álvaro | GK |  | Burgos CF | Burgos CF |
| 07/1998 | | Eizaguirre | GK | | Athletic Club B | Bilbao B |
| 07/1998 | | Díaz Neira | DF | | Athletic Club B | Bilbao B |
| 07/1998 | | Lombraña | MF |  | SCD Durango | Durango |
| 07/1998 | | David | FW |  | UD Almería | Almería |
Departures
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 07/1998 | | Basauri | GK |  | Villarreal CF | Villarreal |
| 07/1998 | | Alberto | DF |  | CE Sabadell | Sabadell |
| 07/1998 | | Iñigo Ros | DF | | CE Sabadell | Sabadell |
| 07/1998 | | Lombraña | DF | | Athletic Club B | Bilbao B |
| 07/1998 | | Aiert | FW |  | Cultural Leonesa | CD Leonesa |
| 07/1998 | | Gallo | FW |  | Barakaldo CF | Barakaldo CF |