| World Cup 1986 Mexico - Appearances as Assistant | ||||
| 31/05/1986 | Spain | - | Brazil | 0:1 |
| 07/06/1986 | Denmark | - | Uruguay | 6:1 |
| World Cup 1986 Mexico - Appearances as Assistant | ||||
| 31/05/1986 | Spain | - | Brazil | 0:1 |
| 07/06/1986 | Denmark | - | Uruguay | 6:1 |
| Complete name: | Johannes Nicolaus Ignacius Keizer |
| Born: | 06/10/1940 |
| Place of birth: |
Volendam, 
Netherlands |
| Nationality: |
Netherlands |