| Youth Bundesliga West 2021/2022 - Appearances as Referee |  |
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| 09/04/2022 | Viktoria Köln | - | Bor. Mönchengladbach | 0:3 | 2 | - | - |
| Youth Bundesliga West 2021/2022 - Appearances as Referee | |
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| 09/04/2022 | Viktoria Köln | - | Bor. Mönchengladbach | 0:3 | 2 | - | - |
| Complete name: | David Markus Koj |
| Born: | 26/09/1993 |
| Place of birth: |
Germany |
| Residence: | Wegberg |
| Nationality: |
Germany |
| Profession: | Beisitzer |
| Club: | Sportclub Wegberg 1912 |