| Youth B Bundesliga West 2018/2019 - Appearances as Referee |  |
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| 25/08/2018 | Borussia Dortmund | - | FC Schalke 04 | 2:0 | 2 | - | - |
| 17/11/2018 | Rot-Weiss Essen | - | Arminia Bielefeld | 0:2 | 2 | - | - |
| Youth B Bundesliga West 2018/2019 - Appearances as Referee | |
|
|
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| 25/08/2018 | Borussia Dortmund | - | FC Schalke 04 | 2:0 | 2 | - | - |
| 17/11/2018 | Rot-Weiss Essen | - | Arminia Bielefeld | 0:2 | 2 | - | - |
| Complete name: | David Markus Koj |
| Born: | 26/09/1993 |
| Place of birth: |
Germany |
| Residence: | Wegberg |
| Nationality: |
Germany |
| Profession: | Beisitzer |
| Club: | Sportclub Wegberg 1912 |