| 6. Round | 13/04/1991 | Urania Genéve Sport | - | FC Aarau | 1:1 | ||||
| 7. Round | 20/04/1991 | FC Aarau | - | FC Locarno | 1:2 |  |
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| 8. Round | 04/05/1991 | FC Locarno | - | FC Aarau | 0:0 | ||||
| 9. Round | 11/05/1991 | FC Aarau | - | Urania Genéve Sport | 2:2 | ||||
| 10. Round | 18/05/1991 | FC Schaffhausen | - | FC Aarau | 0:1 | ||||
| 11. Round | 25/05/1991 | FC Aarau | - | FC Zürich | 2:2 | ||||
| 12. Round | 01/06/1991 | FC La Chaux-de-Fonds | - | FC Aarau | 0:0 | ||||
| 13. Round | 08/06/1991 | FC Aarau | - | BSC Old Boys | 4:0 | ||||
| 14. Round | 12/06/1991 | SC Zug | - | FC Aarau | 1:4 |
Luxembourg