| Europa League 1963/1964 - Appearances as Referee |  |
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| 22/10/1963 | Arsenal FC | - | Stævnet København | 2:3 | - | - | - |
| 19/02/1964 | RFC Liège | - | TJ Spartak ZJŠ Brno | 2:0 | - | - | - |
| 06/05/1964 | Valencia CF | - | 1. FC Köln | 4:1 | - | - | - |
| Europa League 1963/1964 - Appearances as Referee | |
|
|
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| 22/10/1963 | Arsenal FC | - | Stævnet København | 2:3 | - | - | - |
| 19/02/1964 | RFC Liège | - | TJ Spartak ZJŠ Brno | 2:0 | - | - | - |
| 06/05/1964 | Valencia CF | - | 1. FC Köln | 4:1 | - | - | - |
| Complete name: | Pieter Paulus Roomer |
| Born: | 04/06/1920 |
| Place of birth: |
Netherlands |
| Residence: | Rotterdam |
| Nationality: |
Netherlands |