| U20 Friendlies 2021 - Appearances as Referee |  |
 |
 |
||||
| 06/09/2021 | Germany | - | Norway | 1:1 | 3 | - | - |
| U20 Friendlies 2021 - Appearances as Referee | |
|
|
||||
| 06/09/2021 | Germany | - | Norway | 1:1 | 3 | - | - |
| Complete name: | Lasse Koslowski |
| Born: | 14/07/1987 |
| Place of birth: |
Berlin, 
Germany |
| Residence: | Berlin |
| Nationality: |
Germany |
| Profession: | selbständig |
| Club: | Frohnauer SC |