| Cup Winners Cup 1989/1990 - Appearances as Referee |  |
 |
 |
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| 26/09/1989 | Borussia Dortmund | - | Beşiktaş | 2:1 | - | - | - |
| 17/04/1990 | Dinamo Bucureşti | - | RSC Anderlecht | 0:1 | - | - | 1 |
| Cup Winners Cup 1989/1990 - Appearances as Referee | |
|
|
||||
| 26/09/1989 | Borussia Dortmund | - | Beşiktaş | 2:1 | - | - | - |
| 17/04/1990 | Dinamo Bucureşti | - | RSC Anderlecht | 0:1 | - | - | 1 |
| Complete name: | John Blankenstein |
| Born: | 12/02/1949 † 25/08/2006 |
| Place of birth: |
Den Haag, 
Netherlands |
| Nationality: |
Netherlands |