| Europa League 1965/1966 - Appearances as Referee |  |
 |
 |
||||
| 10/11/1965 | Sporting CP | - | Espanyol Barcelona | 2:1 | - | - | - |
| Europa League 1965/1966 - Appearances as Referee | |
|
|
||||
| 10/11/1965 | Sporting CP | - | Espanyol Barcelona | 2:1 | - | - | - |
| Complete name: | William Joseph Mullan |
| Born: | 30/03/1928 † 13/11/2018 |
| Place of birth: |
Dalkeith, 
Scotland |
| Residence: | Cardenden |
| Nationality: |
Scotland |