| 4. Ronde | 31.07.1998 | FC Aarau | - | FC St. Gallen | 2:6 | ||||
| 5. Ronde | 05.08.1998 | Grasshopper Club Zürich | - | FC Aarau | 2:0 |  |
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| 7. Ronde | 22.08.1998 | BSC Young Boys | - | FC Aarau | 1:1 | ||||
| 8. Ronde | 29.08.1998 | FC Aarau | - | FC Lugano | 2:0 | ||||
| 9. Ronde | 08.09.1998 | FC Sion | - | FC Aarau | 3:2 | ||||
| 10. Ronde | 13.09.1998 | FC Luzern | - | FC Aarau | 2:2 | |
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| 11. Ronde | 20.09.1998 | FC Aarau | - | FC Zürich | 0:2 | ||||
| 12. Ronde | 25.09.1998 | FC Aarau | - | Servette FC | 1:4 | ||||
| 14. Ronde | 18.10.1998 | FC Aarau | - | Neuchâtel Xamax FC | 0:2 | ||||
| 15. Ronde | 25.10.1998 | FC St. Gallen | - | FC Aarau | 4:3 |  |
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| 17. Ronde | 08.11.1998 | Lausanne Sports | - | FC Aarau | 2:1 | ||||
| 18. Ronde | 15.11.1998 | FC Aarau | - | BSC Young Boys | 1:1 | ||||
| 19. Ronde | 22.11.1998 | FC Lugano | - | FC Aarau | 0:2 | ||||
| 22. Ronde | 13.12.1998 | FC Zürich | - | FC Aarau | 1:0 |
Polen