| Europa League 1971/1972 - Appearances as Referee |  |
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| 15/09/1971 | FC Lugano | - | Legia Warszawa | 1:3 | 1 | - | - |
| Europa League 1971/1972 - Appearances as Referee | |
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| 15/09/1971 | FC Lugano | - | Legia Warszawa | 1:3 | 1 | - | - |
| Complete name: | Karl Riegg |
| Born: | 15/11/1929 † 15/04/1995 |
| Place of birth: |
Germany |
| Residence: | Augsburg |
| Nationality: |
Germany |
| Bundesliga (GER) appearances: | 109 |