| DFB-Pokal 2020/2021 - Appearances as Assistant | ||||
| 12/09/2020 | FC Carl Zeiss Jena | - | Werder Bremen | 0:2 |
| 03/02/2021 | VfB Stuttgart | - | Bor. Mönchengladbach | 1:2 |
| DFB-Pokal 2020/2021 - Appearances as Assistant | ||||
| 12/09/2020 | FC Carl Zeiss Jena | - | Werder Bremen | 0:2 |
| 03/02/2021 | VfB Stuttgart | - | Bor. Mönchengladbach | 1:2 |
| Complete name: | Lasse Koslowski |
| Born: | 14/07/1987 |
| Place of birth: |
Berlin, 
Germany |
| Residence: | Berlin |
| Nationality: |
Germany |
| Profession: | selbständig |
| Club: | Frohnauer SC |