| Europa League 1985/1986 - Appearances as Referee |  |
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| 05/11/1985 | TJ Bohemians ČKD Praha | - | 1. FC Köln | 2:4 | - | - | - |
| 10/12/1985 | Sporting CP | - | Athletic Club | 3:0 | - | - | - |
| 15/04/1986 | Real Madrid | - | Inter | 5:1 aet | - | - | 1 |
| Europa League 1985/1986 - Appearances as Referee | |
|
|
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| 05/11/1985 | TJ Bohemians ČKD Praha | - | 1. FC Köln | 2:4 | - | - | - |
| 10/12/1985 | Sporting CP | - | Athletic Club | 3:0 | - | - | - |
| 15/04/1986 | Real Madrid | - | Inter | 5:1 aet | - | - | 1 |
| Complete name: | Johannes Nicolaus Ignacius Keizer |
| Born: | 06/10/1940 † 18/11/2024 |
| Place of birth: |
Volendam, 
Netherlands |
| Nationality: |
Netherlands |