| Youth Youth League 2017/2018 - Appearances as Assistant | ||||
| 20/02/2018 | Paris Saint-Germain | - | FC Barcelona | 0:1 |
| 14/03/2018 | Real Madrid | - | Chelsea FC | 2:4 |
| Youth Youth League 2017/2018 - Appearances as Assistant | ||||
| 20/02/2018 | Paris Saint-Germain | - | FC Barcelona | 0:1 |
| 14/03/2018 | Real Madrid | - | Chelsea FC | 2:4 |
| Complete name: | Lasse Koslowski |
| Born: | 14/07/1987 |
| Place of birth: |
Berlin, 
Germany |
| Residence: | Berlin |
| Nationality: |
Germany |
| Profession: | selbständig |
| Club: | Frohnauer SC |