| Europa Conference League Qual. 2023/2024 - Appearances as Assistant | ||||
| 24/08/2023 | KAA Gent | - | APOEL Nikosia | 2:0 |
| 31/08/2023 | Breiðablik | - | FC Struga | 1:0 |
| Europa Conference League Qual. 2023/2024 - Appearances as Assistant | ||||
| 24/08/2023 | KAA Gent | - | APOEL Nikosia | 2:0 |
| 31/08/2023 | Breiðablik | - | FC Struga | 1:0 |
| Complete name: | Lasse Koslowski |
| Born: | 14/07/1987 |
| Place of birth: |
Berlin, 
Germany |
| Residence: | Berlin |
| Nationality: |
Germany |
| Profession: | selbständig |
| Club: | Frohnauer SC |