| 7. Round | 22/08/1998 | BSC Young Boys | - | FC Aarau | 1:1 | ||||
| 9. Round | 08/09/1998 | FC Sion | - | FC Aarau | 3:2 | ||||
| 10. Round | 13/09/1998 | FC Luzern | - | FC Aarau | 2:2 | ||||
| 13. Round | 04/10/1998 | FC Basel 1893 | - | FC Aarau | 1:0 | ||||
| 14. Round | 18/10/1998 | FC Aarau | - | Neuchâtel Xamax FC | 0:2 | ||||
| 15. Round | 25/10/1998 | FC St. Gallen | - | FC Aarau | 4:3 | ||||
| 16. Round | 30/10/1998 | FC Aarau | - | Grasshopper Club Zürich | 0:3 | ||||
| 17. Round | 08/11/1998 | Lausanne Sports | - | FC Aarau | 2:1 | ||||
| 18. Round | 15/11/1998 | FC Aarau | - | BSC Young Boys | 1:1 | ||||
| 19. Round | 22/11/1998 | FC Lugano | - | FC Aarau | 0:2 | ||||
| 20. Round | 29/11/1998 | FC Aarau | - | FC Sion | 2:2 | ||||
| 21. Round | 06/12/1998 | FC Aarau | - | FC Luzern | 0:0 | ||||
| 22. Round | 13/12/1998 | FC Zürich | - | FC Aarau | 1:0 |
Switzerland