Additions
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 09/2026 |  | Jarne Steuckers | FW |  | KRC Genk | KRC Genk |
| 08/2026 |  | Sean Klaiber | DF |  | Brøndby IF | Brøndby IF |
| 08/2026 |  | Charlie Patiño | MF |  | Deportivo A Coruña | Deportivo |
| 08/2026 |  | Aurel Wagbe | MF |  | VfL Bochum II | Bochum II |
| 08/2026 |  | Mansour Ouro-Tagba | FW |  | 1. FC Köln II | Köln II |
| 08/2026 | | Leon Sawas | DF | | VfL Bochum II | Bochum II |
| 07/2026 |  | Karol Mets | DF |  | FC St. Pauli | St. Pauli |
| 07/2026 |  | Tino Casali | GK |  | Rot-Weiss Essen | RW Essen |
| 07/2026 |  | Christian Rasmussen | FW |  | Fortuna Düsseldorf | Düsseldorf |
| 07/2026 |  | Yiğit Karademir | DF |  | VfL Osnabrück | Osnabrück |
| 07/2026 |  | Enis Çokaj | MF |  | Levadiakos | Levadiakos |
| 07/2026 | | Lasse Isbruch | MF |  | VfL Bochum U19 | Bochum U19 |
| 07/2026 | | Jean Manuel Mbom | MF |  | Viborg FF | Viborg FF |
| 07/2026 | | Tom Meyer | MF | | VfL Bochum U19 | Bochum U19 |
| 07/2026 | | Berkan Taz | MF |  | SC Verl | Verl |
| 07/2026 | | Samuel Bamba | FW |  | Willem II | Willem II |
| 07/2026 |  | Babis Drakas | FW |  | Borussia Dortmund II | Dortmund II |
| 07/2026 | | Daniel Hanslik | FW |  | 1. FC Kaiserslautern | K'lautern |
Departures
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 09/2026 |  | Matúš Bero | MF |  | Ferencvárosi TC | Ferencváros |
| 08/2026 |  | Mikkel Rakneberg | DF |  | Odense BK | Odense |
| 08/2026 |  | Noah Loosli | DF |  | Universitatea Cluj | U. Cluj |
| 08/2026 | | Romario Rösch | DF |  | Preußen Münster | Pr. Münster |
| 08/2026 |  | Ibrahim Sissoko | FW |  | Muğlaspor | Muğlaspor |
| 08/2026 | | Kacper Koscierski | DF |  | Alemannia Aachen | Aachen |
| 08/2026 |  | Erhan Mašović | DF |  | Vojvodina | Vojvodina |
| 08/2026 | | Owono-Darnell Keumo | DF |  | Waldhof Mannheim | Waldhof Mannh. |
| 07/2026 | | Samuel Bamba | FW |  | CS Marítimo | CS Marítimo |
| 07/2026 | | Niclas Thiede | GK |  | ADO Den Haag | ADO Den Haag |
| 07/2026 | | Moritz Kwarteng | MF |  | 1. FC Magdeburg | Magdeburg |
| 07/2026 | | Daniel Hülsenbusch | DF |  | SSV Ulm 1846 | SSV Ulm |
| 07/2026 | | Leandro Morgalla | DF |  | RB Salzburg | RB Salzburg |
| 07/2026 | | Niklas Jahn | MF |  | Viktoria Köln | Vikt. Köln |
| 07/2026 | | Louis Köster | MF | | Alemannia Aachen | Aachen |
| 07/2026 | | Cajetan Lenz | MF |  | TSG Hoffenheim | Hoffenheim |
| 07/2026 | | Francis Onyeka | MF |  | SV 07 Elversberg | Elversberg |
| 07/2026 | | Kjell Wätjen | MF |  | Borussia Dortmund | Dortmund |
| 07/2026 | | Farid Alfa-Ruprecht | FW |  | Bayer Leverkusen | Leverkusen |
| 07/2026 |  | Callum Marshall | FW |  | West Ham United | West Ham |
| 07/2026 | | Alexander Bülow | AT-C |  | Sportfreunde Siegen | Siegen |