| Olympic Games 1984 - Appearances as Referee |  |
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 |
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| 30/07/1984 | Yugoslavia | - | Cameroon | 2:1 | - | 1 | - |
| 02/08/1984 | Chile | - | France | 1:1 | - | - | - |
| 11/08/1984 | France | - | Brazil | 2:0 | - | - | - |
| Olympic Games 1984 - Appearances as Referee | |
|
|
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| 30/07/1984 | Yugoslavia | - | Cameroon | 2:1 | - | 1 | - |
| 02/08/1984 | Chile | - | France | 1:1 | - | - | - |
| 11/08/1984 | France | - | Brazil | 2:0 | - | - | - |
| Complete name: | Johannes Nicolaus Ignacius Keizer |
| Born: | 06/10/1940 † 18/11/2024 |
| Place of birth: |
Volendam, 
Netherlands |
| Nationality: |
Netherlands |