| U18 Friendlies 2017 - Appearances as Referee |  |
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| 17/04/2017 | Germany | - | Austria | 3:0 | 1 | - | - |
| U18 Friendlies 2017 - Appearances as Referee | |
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| 17/04/2017 | Germany | - | Austria | 3:0 | 1 | - | - |
| Complete name: | Lasse Koslowski |
| Born: | 14/07/1987 |
| Place of birth: |
Berlin, 
Germany |
| Residence: | Berlin |
| Nationality: |
Germany |
| Profession: | selbständig |
| Club: | Frohnauer SC |