Karl Keller - Football referee
| UEFA Cup 1973 - 1974 | ||||
| 2nd round | Tatran | VfB Stuttgart | 1973-11-07 | 3 - 5 |
| European Cup2 1972 - 1973 | ||||
| 2nd round | Besa | Hibernian | 1972-11-08 | 1 - 1 |
| UEFA Cup 1972 - 1973 | ||||
| 1st round | Porto | Barcelona | 1972-09-14 | 3 - 1 |
| Fairs Cup 1965 - 1966 | ||||
| 1/2 finals | Barcelona | Chelsea F.C. | 1966-04-27 | 2 - 0 |
| European Cup2 1965 - 1966 | ||||
| 2nd round | West Ham United | Olympiakos | 1965-11-24 | 4 - 0 |
| Fairs Cup 1964 - 1965 | ||||
| 2nd round | Wiener SC | Ferencváros | 1964-10-28 | 1 - 0 |
| European Cup 1964-1965 | ||||
| preliminary round | Aris Bonnevoie | Benfica | 1964-09-16 | 1 - 5 |
| European Cup 1963-1964 | ||||
| preliminary round | Austria Wien | Gornik Zabrze | 1963-10-02 | 1 - 0 |
| Fairs Cup 1962 - 1963 | ||||
| round of 16 | Union St Gilloise | Marseille | 1962-10-17 | 4 - 2 |
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