| Champions League 2021/2022 - Appearances as Assistant | ||||
| 19/10/2021 | Atlético Madrid | - | Liverpool FC | 2:3 |
| Champions League 2021/2022 - Appearances as Assistant | ||||
| 19/10/2021 | Atlético Madrid | - | Liverpool FC | 2:3 |
| Complete name: | Lasse Koslowski |
| Born: | 14/07/1987 |
| Place of birth: |
Berlin, 
Germany |
| Residence: | Berlin |
| Nationality: |
Germany |
| Profession: | selbständig |
| Club: | Frohnauer SC |