| Youth B Bundesliga West 2019/2020 - Appearances as Referee |  |
 |
 |
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| 21/08/2019 | Borussia Dortmund | - | FC Schalke 04 | 0:0 | 7 | - | - |
| 09/11/2019 | Wuppertaler SV | - | SV Lippstadt 08 | 0:2 | 3 | - | - |
| 01/03/2020 | FC Schalke 04 | - | SG Unterrath 12/24 | 6:1 | 2 | - | - |
| Youth B Bundesliga West 2019/2020 - Appearances as Referee | |
|
|
||||
| 21/08/2019 | Borussia Dortmund | - | FC Schalke 04 | 0:0 | 7 | - | - |
| 09/11/2019 | Wuppertaler SV | - | SV Lippstadt 08 | 0:2 | 3 | - | - |
| 01/03/2020 | FC Schalke 04 | - | SG Unterrath 12/24 | 6:1 | 2 | - | - |
| Complete name: | David Markus Koj |
| Born: | 26/09/1993 |
| Place of birth: |
Germany |
| Residence: | Wegberg |
| Nationality: |
Germany |
| Profession: | Beisitzer |
| Club: | Sportclub Wegberg 1912 |