| Youth Bundesliga West 2009/2010 - Appearances as Referee |  |
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 |
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| 15/11/2009 | Rot Weiss Ahlen | - | Bor. Mönchengladbach | 0:0 | 4 | - | - |
| Youth Bundesliga West 2009/2010 - Appearances as Referee | |
|
|
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| 15/11/2009 | Rot Weiss Ahlen | - | Bor. Mönchengladbach | 0:0 | 4 | - | - |
| Complete name: | Lasse Koslowski |
| Born: | 14/07/1987 |
| Place of birth: |
Berlin, 
Germany |
| Residence: | Berlin |
| Nationality: |
Germany |
| Profession: | selbständig |
| Club: | Frohnauer SC |