| Champions League 1956/1957 - Appearances as Referee |  |
 |
 |
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| 20/09/1956 | FC Porto | - | Athletic Bilbao | 1:2 | - | - | - |
| 26/09/1956 | Athletic Bilbao | - | FC Porto | 3:2 | - | - | 2 |
| Champions League 1956/1957 - Appearances as Referee | |
|
|
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| 20/09/1956 | FC Porto | - | Athletic Bilbao | 1:2 | - | - | - |
| 26/09/1956 | Athletic Bilbao | - | FC Porto | 3:2 | - | - | 2 |
| Complete name: | Mario Maurelli |
| Born: | 21/04/1914 † |
| Place of birth: |
Sarnano, 
Italy |
| Residence: | Roma |
| Nationality: |
Italy |