Transfers
Recent player movements in and out of the squad
| Date | Player | From | To | Type |
|---|---|---|---|---|
| 01.07.2024 | Y. Stein | — | Union Berlin | N/A |
| 01.07.2024 | J. Siebatcheu | Borussia Mönchengladbach | Union Berlin | N/A |
| 01.07.2024 | I. Prtajin | — | Union Berlin | € 1M |
| 01.07.2024 | M. Kaufmann | Union Berlin | 1. FC Heidenheim | € 1.3M |
| 01.07.2024 | L. Bénes | Hamburger SV | Union Berlin | N/A |
| 01.07.2024 | J. Leweling | Union Berlin | VfB Stuttgart | 5M |
| 15.06.2024 | J. Busk | Union Berlin | Sonderjyske | Free |
| 02.02.2024 | M. Bruns | Union Berlin | — | Free |
| 01.02.2024 | Y. Vertessen | PSV Eindhoven | Union Berlin | € 4.8M |
| 31.01.2024 | K. Behrens | Union Berlin | VfL Wolfsburg | N/A |
| 23.01.2024 | L. Dehl | Union Berlin | — | N/A |
| 18.01.2024 | C. Bedia | Servette FC | Union Berlin | € 2M |
| 18.01.2024 | S. Becker | Union Berlin | Real Sociedad | € 3M |
| 11.01.2024 | K. Vogt | 1899 Hoffenheim | Union Berlin | N/A |
| 11.01.2024 | L. Bonucci | Union Berlin | Fenerbahce | Free |
| 09.01.2024 | Y. Stein | Union Berlin | — | Loan |
| 08.01.2024 | K. Endo | Union Berlin | — | Loan |
| 07.01.2024 | A. Kemlein | Union Berlin | FC St. Pauli | Loan |
| 01.09.2023 | M. Sanogo | Union Berlin | — | — |
| 01.09.2023 | L. Bonucci | Juventus | Union Berlin | Free |
| 31.08.2023 | J. Siebatcheu | Union Berlin | Borussia Mönchengladbach | Loan |
| 31.08.2023 | D. Heintz | Union Berlin | 1. FC Köln | N/A |
| 31.08.2023 | T. Skarke | Union Berlin | SV Darmstadt 98 | Loan |
| 28.08.2023 | M. Pantović | Union Berlin | — | N/A |
| 24.08.2023 | M. Bruns | Union Berlin | — | Loan |
| 17.08.2023 | K. Volland | Monaco | Union Berlin | € 4M |
| 15.08.2023 | R. Gosens | Inter | Union Berlin | N/A |
| 01.08.2023 | M. Thorsby | Union Berlin | Genoa | Loan |
| 27.07.2023 | B. Hollerbach | — | Union Berlin | N/A |
| 26.07.2023 | A. Schwolow | Hertha BSC | Union Berlin | Free |
| 19.07.2023 | L. Tousart | Hertha BSC | Union Berlin | € 3M |
| 13.07.2023 | J. Leweling | Union Berlin | VfB Stuttgart | Loan |
| 11.07.2023 | D. Fofana | Chelsea | Union Berlin | Loan |
| 11.07.2023 | R. van Drongelen | Union Berlin | Samsunspor | N/A |
| 10.07.2023 | L. Grill | Union Berlin | — | Loan |
| 09.07.2023 | B. Aaronson | Leeds | Union Berlin | Loan |
| 01.07.2023 | L. Dehl | — | Union Berlin | N/A |
| 01.07.2023 | M. Kaufmann | FC Copenhagen | Union Berlin | € 2.7M |
| 01.07.2023 | D. Heintz | VfL Bochum | Union Berlin | N/A |
| 01.07.2023 | S. Michel | Union Berlin | FC Augsburg | € 950K |
| 01.07.2023 | K. Möhwald | Union Berlin | — | N/A |
| 01.07.2023 | L. Grill | Bayer Leverkusen | Union Berlin | N/A |
| 01.07.2023 | T. Maciejewski | Union Berlin | — | Free |
| 01.07.2023 | P. Seguin | Union Berlin | FC Schalke 04 | € 750K |
| 01.07.2023 | Diogo Leite | FC Porto | Union Berlin | € 7.5M |
| 01.07.2023 | L. Öztunalı | Union Berlin | Hamburger SV | Free |
| 01.07.2023 | T. Baumgartl | Union Berlin | PSV Eindhoven | N/A |
| 01.07.2023 | A. Král | — | Union Berlin | Loan |
| 01.07.2023 | T. Puchacz | Union Berlin | — | Loan |
| 01.07.2023 | T. Skarke | FC Schalke 04 | Union Berlin | N/A |