| Youth Youth League 2021/2022 - Appearances as Assistant | ||||
| 02/03/2022 | Real Madrid | - | Atlético Madrid | 2:3 |
| Youth Youth League 2021/2022 - Appearances as Assistant | ||||
| 02/03/2022 | Real Madrid | - | Atlético Madrid | 2:3 |
| Complete name: | Thorben Siewer |
| Born: | 05/07/1987 |
| Place of birth: |
Germany |
| Residence: | Drolshagen |
| Nationality: |
Germany |
| Profession: | Controller |
| Club: | FC Schreibershof |