| 1. Round | 18/07/1998 | FC St. Gallen | - | BSC Young Boys | 3:1 | ||||
| 2. Round | 21/07/1998 | FC Lugano | - | FC St. Gallen | 2:2 | ||||
| 3. Round | 25/07/1998 | FC St. Gallen | - | FC Sion | 2:0 | ||||
| 4. Round | 31/07/1998 | FC Aarau | - | FC St. Gallen | 2:6 |  |
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| 5. Round | 07/08/1998 | FC St. Gallen | - | FC Zürich | 0:0 | ||||
| 6. Round | 15/08/1998 | Servette FC | - | FC St. Gallen | 1:0 | ||||
| 7. Round | 23/08/1998 | FC St. Gallen | - | FC Basel 1893 | 0:1 | ||||
| 8. Round | 28/08/1998 | Neuchâtel Xamax FC | - | FC St. Gallen | 2:0 | ||||
| 9. Round | 06/09/1998 | FC St. Gallen | - | FC Luzern | 2:1 | ||||
| 10. Round | 11/09/1998 | FC St. Gallen | - | Grasshopper Club Zürich | 3:1 | ||||
| 11. Round | 20/09/1998 | Lausanne Sports | - | FC St. Gallen | 1:0 | ||||
| 13. Round | 03/10/1998 | FC St. Gallen | - | FC Lugano | 4:4 |  |
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| 14. Round | 18/10/1998 | FC Sion | - | FC St. Gallen | 2:1 | ||||
| 15. Round | 25/10/1998 | FC St. Gallen | - | FC Aarau | 4:3 | ||||
| 16. Round | 30/10/1998 | FC Zürich | - | FC St. Gallen | 3:1 | |
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| 17. Round | 08/11/1998 | FC St. Gallen | - | Servette FC | 0:0 | ||||
| 18. Round | 15/11/1998 | FC Basel 1893 | - | FC St. Gallen | 1:0 | ||||
| 22. Round | 13/12/1998 | FC St. Gallen | - | Lausanne Sports | 0:1 |
Bulgaria