| Player | From | Fee | Date |
|---|---|---|---|
| Kwarteng Moritz-Broni | VfL Bochum | 1.2M | 11.08.2027 |
| Jäger Marco | Free Agent | Free | 23.08.2027 |
| Böhm Marc | Free Agent | Free | 23.08.2027 |
| Fischer Helmut | Free Agent | Free | 23.08.2027 |
| Krause Karl | Free Agent | Free | 23.08.2027 |
| Horn Florian | Free Agent | Free | 23.08.2027 |
| Weiß Helmut | Free Agent | Free | 23.08.2027 |
| Londoño Kevin | Free Agent | Free | 27.08.2027 |
| Bandez José | Free Agent | Free | 29.08.2027 |
| Markgraf Andrik | Free Agent | Free | 09.09.2027 |
| Moreno Jorge | Free Agent | Free | 19.01.2028 |
| Telalović Semir | Nürnberg | 3.8M | 20.01.2028 |
| Kuziemka Maciej | Free Agent | Free | 10.02.2028 |
| Marcinho | Free Agent | Free | 05.03.2028 |
| Kleindienst Tim | Borussia Mönchengladbach | 4.4M | 07.06.2028 |
| Böhm Marco | Schalke 04 | 740.0K | 07.06.2028 |
| Herrera Aaron | Free Agent | Free | 19.06.2028 |
| Player | To | Fee | Date |
|---|---|---|---|
| Ljubičić Marin | Hajduk Split | 19.3M | 22.06.2028 |
| Friedrich Marvin | Borussia Mönchengladbach | 3.9M | 29.08.2027 |
| Schäfer András | Nürnberg | Free | 01.09.2027 |
| Juranović Josip | Free Agent | Free | 01.09.2027 |
| Uduokhai Felix | Free Agent | Free | 01.09.2027 |
| Markgraf Andrik | Free Agent | Free | 01.09.2027 |
| Schuster Tim | Free Agent | Free | 01.09.2027 |
| Ali Elias | Free Agent | Free | 29.01.2028 |
| Jeong Woo-Yeong | Borussia Mönchengladbach | 23.9M | 27.06.2028 |
| Sánchez Erick | PSV | 29.5M | 26.08.2027 |
| Player | From | Date | End Date |
|---|---|---|---|
| Gnémagnon Nathan | FC Metz | 26.08.2027 | 22.05.2028 |
| Moreira Afonso | Bayer Leverkusen | 29.08.2027 | 25.04.2028 |
| Ocansey Vincent | Arminia Bielefeld | 07.09.2027 | 04.05.2028 |
| Reich Lukas | Greuther Fürth | 15.06.2028 | 11.04.2029 |
| Debrah Jeremiah | Mainz 05 | 25.06.2028 | 21.04.2029 |
| Player | To | Date | End Date |
|---|---|---|---|
| Klaus Carl | SC Paderborn | 10.08.2027 | 06.05.2028 |