| Bundesliga 1990/1991 Upper Play-Off - Appearances as Referee |  |
 |
 |
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| 26/04/1991 | Admira/Wacker | - | Rapid Wien | 2:2 | 3 | - | 2 |
| Bundesliga 1990/1991 Upper Play-Off - Appearances as Referee | |
|
|
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| 26/04/1991 | Admira/Wacker | - | Rapid Wien | 2:2 | 3 | - | 2 |
| Complete name: | Heinz Prohaska |
| Born: | 26/04/1944 |
| Place of birth: |
Wien, 
Austria |
| Nationality: |
Austria |
| Profession: | Briefträger |