| Cup Winners Cup 1979/1980 - Appearances as Referee |  |
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 |
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| 19/09/1979 | SSW Innsbruck | - | TJ Lokomotíva Košice | 1:2 | - | - | - |
| 04/03/1980 | HNK Rijeka | - | Juventus | 0:0 | - | - | - |
| Cup Winners Cup 1979/1980 - Appearances as Referee | |
|
|
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| 19/09/1979 | SSW Innsbruck | - | TJ Lokomotíva Košice | 1:2 | - | - | - |
| 04/03/1980 | HNK Rijeka | - | Juventus | 0:0 | - | - | - |
| Complete name: | Johannes Nicolaus Ignacius Keizer |
| Born: | 06/10/1940 † 18/11/2024 |
| Place of birth: |
Volendam, 
Netherlands |
| Nationality: |
Netherlands |