| Period | Club | on loan from | buy option |
|---|---|---|---|
 Borussia Dortmund | - | ||
| VfL Bochum | - | ||
| VfL Hörde 1912 | - | ||
 Ferencvárosi TC | - | ||
| Ferencvárosi TC | - | ||
| Fortuna Düsseldorf | - | ||
| 1. FSV Mainz 05 | - | ||
| FC St. Pauli | 1. FSV Mainz 05 | ||
| 1. FSV Mainz 05 | - | ||
| Borussia Dortmund | - | ||
| MSV Duisburg | Borussia Dortmund | ||
| Borussia Dortmund | - | ||
| MSV Duisburg | MSV Duisburg | ||
| Borussia Dortmund | - | ||
| MSV Duisburg | Borussia Dortmund | ||
| Borussia Dortmund | - | ||
| VfL Hörde 1912 | - |
Julian Koch - Clubs
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