| Europa League 2020/2021 - Appearances as Referee |  |
 |
 |
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| 29/10/2020 | Slavia Praha | - | Bayer Leverkusen | 1:0 | 5 | - | 1 |
| 05/11/2020 | Zorya Lugansk | - | AEK Athen | 1:4 | 4 | - | - |
| 25/02/2021 | AFC Ajax | - | Lille OSC | 2:1 | 6 | - | - |
| Europa League 2020/2021 - Appearances as Referee | |
|
|
||||
| 29/10/2020 | Slavia Praha | - | Bayer Leverkusen | 1:0 | 5 | - | 1 |
| 05/11/2020 | Zorya Lugansk | - | AEK Athen | 1:4 | 4 | - | - |
| 25/02/2021 | AFC Ajax | - | Lille OSC | 2:1 | 6 | - | - |
| Complete name: | William Collum |
| Born: | 18/01/1979 |
| Place of birth: |
Glasgow, 
Scotland |
| Residence: | Motherwell |
| Nationality: |
Scotland |
| Profession: | Lehrer |
| Height: | 174 cm |
| Weight: | 69 kg |