| 2. Bundesliga 2023/2024 - Appearances as Assistant | ||||
| 05/08/2023 | FC Schalke 04 | - | 1. FC Kaiserslautern | 3:0 |
| 05/11/2023 | Hansa Rostock | - | Hertha BSC | 0:0 |
| 19/01/2024 | Karlsruher SC | - | VfL Osnabrück | 2:1 |
| 2. Bundesliga 2023/2024 - Appearances as Assistant | ||||
| 05/08/2023 | FC Schalke 04 | - | 1. FC Kaiserslautern | 3:0 |
| 05/11/2023 | Hansa Rostock | - | Hertha BSC | 0:0 |
| 19/01/2024 | Karlsruher SC | - | VfL Osnabrück | 2:1 |
| Complete name: | Thorben Siewer |
| Born: | 05/07/1987 |
| Place of birth: |
Germany |
| Residence: | Drolshagen |
| Nationality: |
Germany |
| Profession: | Controller |
| Club: | FC Schreibershof |