| Europa League Qual. 2018/2019 - Appearances as Assistant | ||||
| 26/07/2018 | Aberdeen FC | - | Burnley FC | 1:1 |
| 16/08/2018 | FC Basel | - | Vitesse | 1:0 |
| 23/08/2018 | APOEL Nikosia | - | FK Astana | 1:0 |
| Europa League Qual. 2018/2019 - Appearances as Assistant | ||||
| 26/07/2018 | Aberdeen FC | - | Burnley FC | 1:1 |
| 16/08/2018 | FC Basel | - | Vitesse | 1:0 |
| 23/08/2018 | APOEL Nikosia | - | FK Astana | 1:0 |
| Complete name: | Lasse Koslowski |
| Born: | 14/07/1987 |
| Place of birth: |
Berlin, 
Germany |
| Residence: | Berlin |
| Nationality: |
Germany |
| Profession: | selbständig |
| Club: | Frohnauer SC |