| Youth Youth League 2023/2024 - Appearances as Assistant | ||||
| 13/03/2024 | AC Milan | - | Real Madrid | 4:3 pso |
| Youth Youth League 2023/2024 - Appearances as Assistant | ||||
| 13/03/2024 | AC Milan | - | Real Madrid | 4:3 pso |
| Complete name: | Lasse Koslowski |
| Born: | 14/07/1987 |
| Place of birth: |
Berlin, 
Germany |
| Residence: | Berlin |
| Nationality: |
Germany |
| Profession: | selbständig |
| Club: | Frohnauer SC |