| Europa League 1989/1990 - Appearances as Referee |  |
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| 11/09/1989 | AJ Auxerre | - | KF Apolonia Fier | 5:0 | - | - | - |
| Europa League 1989/1990 - Appearances as Referee | |
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| 11/09/1989 | AJ Auxerre | - | KF Apolonia Fier | 5:0 | - | - | - |
| Complete name: | Serge Muhmenthaler |
| Born: | 20/05/1953 |
| Place of birth: |
Grenchen, 
Switzerland |
| Nationality: |
Switzerland |
| Bundesliga (GER) appearances: | 4 |