| Champions League 1963/1964 - Appearances as Referee |  |
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| 02/10/1963 | Austria Wien | - | Górnik Zabrze | 1:0 | - | - | - |
| Champions League 1963/1964 - Appearances as Referee | |
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| 02/10/1963 | Austria Wien | - | Górnik Zabrze | 1:0 | - | - | - |
| Complete name: | Karl Keller |
| Born: | 01/04/1923 |
| Place of birth: |
Switzerland |
| Residence: | Basel |
| Nationality: |
Switzerland |