| Europa League | Matches | W | D | L |  |
 |
 |
| home | 1 | 1 | - | - | - | - | - |
| away | 1 | - | - | 1 | - | - | - |
| overall | 2 | 1 | - | 1 | - | - | - |
| Europa League | Home | - | Guest | |
|
|
Results |
| 27/04/66 | FC Barcelona | - | Chelsea FC | - | - | - | 2:0 |
| 20/09/72 | FC Porto | - | FC Barcelona | - | - | - | 3:1 |
| Europa League | Matches | W | D | L | |
|
|
| home | 1 | 1 | - | - | - | - | - |
| away | 1 | - | - | 1 | - | - | - |
| overall | 2 | 1 | - | 1 | - | - | - |
| Europa League | Home | - | Guest | |
|
|
Results |
| 27/04/66 | FC Barcelona | - | Chelsea FC | - | - | - | 2:0 |
| 20/09/72 | FC Porto | - | FC Barcelona | - | - | - | 3:1 |
| Complete name: | Karl Keller |
| Born: | 01/04/1923 |
| Place of birth: |
Switzerland |
| Residence: | Basel |
| Nationality: |
Switzerland |