| Europa League 1967/1968 - Appearances as Referee |  |
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| 04/10/1967 | Linfield FC | - | 1. FC Lokomotive Leipzig | 1:0 | - | - | - |
| Europa League 1967/1968 - Appearances as Referee | |
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| 04/10/1967 | Linfield FC | - | 1. FC Lokomotive Leipzig | 1:0 | - | - | - |
| Complete name: | William Joseph Mullan |
| Born: | 30/03/1928 † 13/11/2018 |
| Place of birth: |
Dalkeith, 
Scotland |
| Residence: | Cardenden |
| Nationality: |
Scotland |