| 21. Round | 06/02/1999 | Racing Santander | - | Athletic Club | 2:0 | ||||
| 22. Round | 13/02/1999 | Athletic Club | - | CF Extremadura | 0:0 | ||||
| 26. Round | 13/03/1999 | Athletic Club | - | UD Salamanca | 1:0 | ||||
| 27. Round | 19/03/1999 | Espanyol Barcelona | - | Athletic Club | 1:1 | ||||
| 33. Round | 08/05/1999 | Deportivo La Coruña | - | Athletic Club | 1:1 | ||||
| 34. Round | 15/05/1999 | Athletic Club | - | Villarreal CF | 2:0 | ||||
| 35. Round | 22/05/1999 | Real Valladolid | - | Athletic Club | 0:3 | ||||
| 37. Round | 12/06/1999 | Athletic Club | - | CD Alavés | 5:0 |
Spain