| Youth Youth League 2018/2019 - Appearances as Referee |  |
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 |
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| 18/09/2018 | AS Monaco | - | Atlético Madrid | 0:2 | 6 | - | - |
| 11/12/2018 | Galatasaray | - | FC Porto | 0:2 | 5 | - | - |
| Youth Youth League 2018/2019 - Appearances as Referee | |
|
|
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| 18/09/2018 | AS Monaco | - | Atlético Madrid | 0:2 | 6 | - | - |
| 11/12/2018 | Galatasaray | - | FC Porto | 0:2 | 5 | - | - |
| Complete name: | Stephan Klossner |
| Born: | 30/05/1981 |
| Place of birth: |
Switzerland |
| Nationality: |
Switzerland |