Additions
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 07/2026 |  | Alynho Haïdara | FW |  | Académie Mainz 05 | Académie Mainz 05 |
| 07/2026 |  | Daniel Posch | GK |  | 1. FSV Mainz 05 U19 | Mainz 05 U19 |
| 07/2026 |  | Fynn Hillbrunner | DF | | 1. FSV Mainz 05 U19 | Mainz 05 U19 |
| 07/2026 | | Rael Nakuzola | DF |  | Rot-Weiss Essen U19 | Rot-Weiss Essen U19 |
| 07/2026 | | Jakob Vött | DF |  | Rot-Weiß Walldorf | RW Walldorf |
| 07/2026 | | Nick Cherny | MF |  | Borussia Dortmund II | Dortmund II |
| 07/2026 |  | Otto Ruoppi | MF |  | Kuopion PS | KuPS |
| 07/2026 | | Tobias Weileder | MF | | 1. FSV Mainz 05 U19 | Mainz 05 U19 |
| 07/2026 | | Benedict Hollerbach | FW |  | 1. FSV Mainz 05 | Mainz 05 |
| 07/2026 |  | Smail Kadrijaj | FW |  | SV Darmstadt 98 II | Darmstadt 98 II |
| 07/2026 | | Benjamin Bletry | AT-C |
Departures
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 07/2026 | | Niklas Tauer | MF |  | TSV Havelse | TSV Havelse |
| 07/2026 | | Maxim Dal | DF |  | SpVgg Greuther Fürth | Gr. Fürth |
| 07/2026 |  | Kasey Bos | DF |  | SBV Excelsior | Excelsior |
| 07/2026 | | Tim Müller | DF |  | TSG Hoffenheim II | Hoffenheim II |
| 07/2026 | | Nikolas Veratschnig | DF |  | RB Salzburg | RB Salzburg |
| 07/2026 | | Jason Amann | MF |  | Viktoria Köln | Vikt. Köln |
| 07/2026 | | Fritz Engel | MF |  | Loyola Marymount Lions | Loyola Marymount Lions |
| 07/2026 | | Daniel Gleiber | MF |  | 1. FC Saarbrücken | Saarbrücken |
| 07/2026 | | Denis Linsmayer | MF |  | 1. FC Kaiserslautern II | K'lautern II |
| 07/2026 | | Justin Seven | MF |  | BFC Dynamo | BFC Dynamo |
| 07/2026 |  | Nayrobi Vargas | FW |  | CD Marathón | CD Marathón |