| Europa League Qual. 2021/2022 - Appearances as Assistant | ||||
| 12/08/2021 | Celtic FC | - | FK Jablonec | 3:0 |
| Europa League Qual. 2021/2022 - Appearances as Assistant | ||||
| 12/08/2021 | Celtic FC | - | FK Jablonec | 3:0 |
| Complete name: | Lasse Koslowski |
| Born: | 14/07/1987 |
| Place of birth: |
Berlin, 
Germany |
| Residence: | Berlin |
| Nationality: |
Germany |
| Profession: | selbständig |
| Club: | Frohnauer SC |