Oluwaseun God Power Osaro Ogbemudia
Union BerlinLoan—31 Aug 2026
Owono Darnell Keumo
VfL BochumLoan—3 Aug 2026- L. Mickels
ZiraFree agent—21 Jul 2026 
Gonçalo Gregório
FC NoahFree agent—3 Jul 2026- Y. Hor
1899 HoffenheimFree agent—1 Jul 2026 - Y. Hor1899 HoffenheimFree agent—1 Jul 2026
- L. MickelsZiraFree agent—29 Jun 2026
- L. Bierschenk
FSV Mainz 05Transfer—20 Jan 2026 - L. BierschenkFSV Mainz 05Transfer—20 Jan 2026
V. ThillZiraFree agent—14 Jan 2026- Oluwaseun God Power Osaro OgbemudiaUnion BerlinLoan—2 Jan 2026
- V. ThillZiraFree agent—21 Oct 2025
T. Nijhuis
HJK HelsinkiTransfer—8 Aug 2025- J. Brandt
SC Paderborn 07Free agent—30 Jun 2025 - A. Ferati
Fortuna SittardFree Transfer—13 Jan 2025 
Manuel Braun
VfL WolfsburgLoan—2 Sept 2024
H. Matriciani
FC Schalke 04Loan—26 Aug 2024
- Oluwaseun God Power Osaro OgbemudiaUnion BerlinReturn from loan—29 Jun 2026
K. OkpalaSC Paderborn 07Transfer—1 Jan 2026
K. OkpalaSC Paderborn 07Transfer—1 Jan 2026- J. Bartels
Dunajska StredaFree Transfer—4 Sept 2025 - H. MatricianiFC Schalke 04Back from Loan—1 Jul 2025
- J. BartelsDunajska StredaFree agent—29 Jun 2025
- Manuel BraunVfL WolfsburgReturn from loan—29 Jun 2025
- M. Albenas
CSKA 1948Free agent—11 Jan 2025 - Y. Mabella
Racing FC Union LuxembourgFree—23 Jul 2024 
L. Jans
SK BeverenFree—4 Jul 2024
A. Lebeau
Stade Brestois 29Free—4 Aug 2023- D. Martinović
SV ElversbergFree—1 Jul 2023 - A. FeratiFortuna SittardFree—29 Jul 2021
- M. SchusterSC Paderborn 07Free—1 Jul 2021
- K. ConradSV ElversbergFree—1 Jul 2020
A. Ivan
New York Red Bulls——1 Jul 2018- H. Balitsch
1. FC Köln€ 1.5M1 Jul 2001