| Champions League 2019/2020 - Appearances as Referee |  |
 |
 |
||||
| 01/10/2019 | Juventus | - | Bayer Leverkusen | 3:0 | 2 | - | - |
| Champions League 2019/2020 - Appearances as Referee | |
|
|
||||
| 01/10/2019 | Juventus | - | Bayer Leverkusen | 3:0 | 2 | - | - |
| 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 |