| Youth Bundesliga West 2018/2019 - Appearances as Referee |  |
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 |
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| 12/08/2018 | Alemannia Aachen | - | MSV Duisburg | 1:3 | 4 | - | - |
| 20/10/2018 | 1. FC Köln | - | Bor. Mönchengladbach | 0:1 | 3 | - | 1 |
| 17/02/2019 | Borussia Dortmund | - | FC Schalke 04 | 0:1 | 5 | - | - |
| Youth Bundesliga West 2018/2019 - Appearances as Referee | |
|
|
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| 12/08/2018 | Alemannia Aachen | - | MSV Duisburg | 1:3 | 4 | - | - |
| 20/10/2018 | 1. FC Köln | - | Bor. Mönchengladbach | 0:1 | 3 | - | 1 |
| 17/02/2019 | Borussia Dortmund | - | FC Schalke 04 | 0:1 | 5 | - | - |
| Complete name: | Jan Dennemärker |
| Born: | |
| Place of birth: |
Germany |
| Nationality: |
Germany |