Additions
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 10/2026 |  | Lion Schweers | DF |  | Bor. Mönchengladbach II | M'gladbach II |
| 10/2026 | | Josiah Uwakhonye | FW | | Bor. Mönchengladbach II | M'gladbach II |
| 09/2026 | | Niklas Lanwehr | AS-CO | |||
| 09/2026 | | Alexander Blessin | MA | |||
| 09/2026 | | Nicolas Kühn | FW |  | Como 1907 | Como 1907 |
| 08/2026 |  | Kō Itakura | DF |  | AFC Ajax | Ajax |
| 08/2026 | | Mathieu Nguefack | MF |  | Bor. Mönchengladbach U21 | U21 |
| 07/2026 | | Daiki Hashioka | DF |  | Slavia Praha | Slavia Praha |
| 07/2026 |  | Jan Leszczyński | DF |  | Legia Warszawa | Legia |
| 07/2026 | | Daniel Batz | GK |  | 1. FSV Mainz 05 | Mainz 05 |
| 07/2026 | | David Herold | DF |  | Karlsruher SC | Karlsruhe |
| 07/2026 |  | Yukhym Konoplya | DF |  | Shakhtar Donetsk | Shakhtar |
| 07/2026 | | Enzo Leopold | MF |  | Hannover 96 | Hannover |
| 07/2026 | | Zento Uno | MF |  | Shimizu S-Pulse | S-Pulse |
| 07/2026 |  | Tomáš Čvančara | FW |  | Celtic FC | Celtic |
| 07/2026 |  | Iaia Danfa | FW | | Bor. Mönchengladbach II | M'gladbach II |
| 07/2026 |  | Isac Lidberg | FW |  | SV Darmstadt 98 | Darmstadt |
| 07/2026 |  | Noah Pesch | FW |  | 1. FC Magdeburg | Magdeburg |
| 07/2026 |  | Grant-Leon Ranos | FW |  | Eintracht Braunschweig | Braunschweig |
| 07/2026 | | Markus Gellhaus | AS-CO |  | Hansa Rostock | Rostock |
| 07/2026 | | Jan-Moritz Lichte | AS-CO | |||
| 07/2026 | | Philipp Schützendorf | AS-CO | |||
| 07/2026 | | Jörn Menger | AT-C |
Departures
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 09/2026 | | Tomáš Čvančara | FW |  | FC Hradec Králové | Hradec Králové |
| 08/2026 |  | Nico Elvedi | DF |  | Leeds United | Leeds Utd |
| 08/2026 |  | Nathan Ngoumou | FW |  | OGC Nice | Nice |
| 08/2026 |  | Gio Reyna | MF |  | Racing Strasbourg | Strasbourg |
| 07/2026 | | Grant-Leon Ranos | FW |  | CD Tenerife | Tenerife |
| 07/2026 | | Noah Pesch | FW |  | Rot-Weiss Essen | RW Essen |
| 07/2026 |  | Tiago Pereira Cardoso | GK |  | RAAL La Louvière | La Louvière |
| 07/2026 | | Marvin Friedrich | DF |  | 1. FC Union Berlin | Union Berlin |
| 07/2026 | | Kōta Takai | DF |  | Tottenham Hotspur | Tottenham |
| 07/2026 | | Yannik Engelhardt | MF |  | SC Freiburg | Freiburg |
| 07/2026 | | Rocco Reitz | MF |  | RB Leipzig | RB Leipzig |
| 07/2026 | | Niklas Swider | MF |  | Viktoria Köln | Vikt. Köln |
| 07/2026 |  | Alejo Sarco | FW |  | Bayer Leverkusen | Leverkusen |
| 07/2026 |  | Haris Tabaković | FW |  | TSG Hoffenheim | Hoffenheim |
| 07/2026 | | Jan Urbich | FW | | Eintracht Braunschweig | Braunschweig |
| 07/2026 | | Oliver Neuville | AS-CO | | Bor. Mönchengladbach II | M'gladbach II |