| U21 EURO Qualifiers 2023/2024 - Appearances as Assistant | ||||
| 12/10/2023 | England | - | Serbia | 9:1 |
| 21/03/2024 | Scotland | - | Kazakhstan | 4:1 |
| U21 EURO Qualifiers 2023/2024 - Appearances as Assistant | ||||
| 12/10/2023 | England | - | Serbia | 9:1 |
| 21/03/2024 | Scotland | - | Kazakhstan | 4:1 |
| Complete name: | Lasse Koslowski |
| Born: | 14/07/1987 |
| Place of birth: |
Berlin, 
Germany |
| Residence: | Berlin |
| Nationality: |
Germany |
| Profession: | selbständig |
| Club: | Frohnauer SC |