| KNVB beker 1986/1987 - Appearances as Referee |  |
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| 11/10/1986 | EVV Eindhoven | - | FC Groningen | 1:2 | 1 | - | - |
| 21/02/1987 | Feyenoord | - | FC Den Haag | 1:2 aet | 3 | - | - |
| 31/03/1987 | FC Den Haag | - | SBV Excelsior | 3:1 | 1 | - | - |
| KNVB beker 1986/1987 - Appearances as Referee | |
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| 11/10/1986 | EVV Eindhoven | - | FC Groningen | 1:2 | 1 | - | - |
| 21/02/1987 | Feyenoord | - | FC Den Haag | 1:2 aet | 3 | - | - |
| 31/03/1987 | FC Den Haag | - | SBV Excelsior | 3:1 | 1 | - | - |
| Complete name: | Johannes Nicolaus Ignacius Keizer |
| Born: | 06/10/1940 † 18/11/2024 |
| Place of birth: |
Volendam, 
Netherlands |
| Nationality: |
Netherlands |