| Europa League 1980/1981 - Appearances as Referee |  |
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| 04/11/1980 | 1. FC Magdeburg | - | Torino FC | 1:0 | - | - | - |
| Europa League 1980/1981 - Appearances as Referee | |
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| 04/11/1980 | 1. FC Magdeburg | - | Torino FC | 1:0 | - | - | - |
| Complete name: | Johannes Nicolaus Ignacius Keizer |
| Born: | 06/10/1940 |
| Place of birth: |
Volendam, 
Netherlands |
| Nationality: |
Netherlands |