| Champions League 1977/1978 - Appearances as Referee |  |
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| 28/09/1977 | Jeunesse Esch | - | Celtic FC | 1:6 | 1 | - | - |
| Champions League 1977/1978 - Appearances as Referee | |
|
|
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| 28/09/1977 | Jeunesse Esch | - | Celtic FC | 1:6 | 1 | - | - |
| Complete name: | Siem Wellinga |
| Born: | 09/03/1931 |
| Place of birth: |
Netherlands |
| Residence: | Boekelo |
| Nationality: |
Netherlands |