| Youth Bundesliga West 2008/2009 - Appearances as Referee |  |
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| 16/08/2008 | Bor. Mönchengladbach | - | SV Bergisch Gladbach 09 | 5:0 | - | - | - |
| 22/03/2009 | MSV Duisburg | - | Bayer Leverkusen | 2:2 | - | - | - |
| Youth Bundesliga West 2008/2009 - Appearances as Referee | |
|
|
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| 16/08/2008 | Bor. Mönchengladbach | - | SV Bergisch Gladbach 09 | 5:0 | - | - | - |
| 22/03/2009 | MSV Duisburg | - | Bayer Leverkusen | 2:2 | - | - | - |
| Complete name: | Thorben Siewer |
| Born: | 05/07/1987 |
| Place of birth: |
Germany |
| Residence: | Drolshagen |
| Nationality: |
Germany |
| Profession: | Controller |
| Club: | FC Schreibershof |