| Youth DFB-Pokal 2010/2011 - Appearances as Referee |  |
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| 26/09/2010 | VfL Wolfsburg | - | 1. FC Köln | 2:0 aet | - | - | - |
| 21/04/2011 | Hansa Rostock | - | Werder Bremen | 2:1 aet | 4 | 1 | - |
| Youth DFB-Pokal 2010/2011 - Appearances as Referee | |
|
|
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| 26/09/2010 | VfL Wolfsburg | - | 1. FC Köln | 2:0 aet | - | - | - |
| 21/04/2011 | Hansa Rostock | - | Werder Bremen | 2:1 aet | 4 | 1 | - |
| Complete name: | Lasse Koslowski |
| Born: | 14/07/1987 |
| Place of birth: |
Berlin, 
Germany |
| Residence: | Berlin |
| Nationality: |
Germany |
| Profession: | selbständig |
| Club: | Frohnauer SC |