| Champions League 1983/1984 - Appearances as Referee |  |
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 |
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| 19/10/1983 | Dinamo Bucureşti | - | Hamburger SV | 3:0 | 3 | - | - |
| 07/03/1984 | AS Roma | - | BFC Dynamo | 3:0 | - | - | - |
| Champions League 1983/1984 - Appearances as Referee | |
|
|
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| 19/10/1983 | Dinamo Bucureşti | - | Hamburger SV | 3:0 | 3 | - | - |
| 07/03/1984 | AS Roma | - | BFC Dynamo | 3:0 | - | - | - |
| Complete name: | Johannes Nicolaus Ignacius Keizer |
| Born: | 06/10/1940 |
| Place of birth: |
Volendam, 
Netherlands |
| Nationality: |
Netherlands |