Transfers
Recent player movements in and out of the squad
| Date | Player | From | To | Type |
|---|---|---|---|---|
| 06.07.2025 | R. Zieler | — | 1. FC Köln | Transfer |
| 05.07.2025 | R. Zieler | — | 1. FC Köln | Transfer |
| 05.07.2025 | T. Krauß | FSV Mainz 05 | 1. FC Köln | Loan |
| 04.07.2025 | J. Kamiński | VfL Wolfsburg | 1. FC Köln | Loan |
| 04.07.2025 | T. Krauß | FSV Mainz 05 | 1. FC Köln | Loan |
| 03.07.2025 | J. Kamiński | VfL Wolfsburg | 1. FC Köln | Loan |
| 03.07.2025 | Max Finkgräfe | 1. FC Köln | RB Leipzig | Transfer |
| 02.07.2025 | Max Finkgräfe | 1. FC Köln | RB Leipzig | Transfer |
| 02.07.2025 | O. Schmitt | 1. FC Köln | — | Free agent |
| 01.07.2025 | S. Adamyan | — | 1. FC Köln | Back from Loan |
| 01.07.2025 | E. Bakatukanda | FC BW Linz | 1. FC Köln | N/A |
| 01.07.2025 | F. Dietz | SCR Altach | 1. FC Köln | Back from Loan |
| 01.07.2025 | M. Olesen | 1. FC Köln | — | Free Transfer |
| 01.07.2025 | A. Racioppi | 1. FC Köln | — | N/A |
| 01.07.2025 | R. Carstensen | Lech Poznan | 1. FC Köln | N/A |
| 01.07.2025 | D. Ljubičić | 1. FC Köln | Dinamo Zagreb | Free Transfer |
| 01.07.2025 | S. El Mala | — | 1. FC Köln | Back from Loan |
| 01.07.2025 | M. El Mala | — | 1. FC Köln | Back from Loan |
| 01.07.2025 | Max Lippert | — | 1. FC Köln | Loan |
| 01.07.2025 | T. Lemperle | 1. FC Köln | 1899 Hoffenheim | Free Transfer |
| 01.07.2025 | C. Onuoha | — | 1. FC Köln | N/A |
| 30.06.2025 | G. Strauch | 1. FC Köln | — | Free agent |
| 30.06.2025 | R. Ache | — | 1. FC Köln | Transfer |
| 30.06.2025 | Í. Bergmann Jóhannesson | Fortuna Düsseldorf | 1. FC Köln | Transfer |
| 30.06.2025 | M. Sponsel | 1. FC Köln | — | Free agent |
| 30.06.2025 | L. Dürholtz | SV Elversberg | 1. FC Köln | Free agent |
| 30.06.2025 | J. Nickisch | 1. FC Köln | — | Free agent |
| 30.06.2025 | M. Obuz | 1. FC Köln | — | Free agent |
| 30.06.2025 | T. Lemperle | 1. FC Köln | 1899 Hoffenheim | Free agent |
| 29.06.2025 | F. Dietz | SCR Altach | 1. FC Köln | Return from loan |
| 29.06.2025 | P. Wydra | — | 1. FC Köln | Return from loan |
| 29.06.2025 | S. El Mala | — | 1. FC Köln | Return from loan |
| 29.06.2025 | Justin-Kai von der Hitz | 1. FC Köln | — | Free agent |
| 29.06.2025 | R. Carstensen | Lech Poznan | 1. FC Köln | Return from loan |
| 29.06.2025 | M. El Mala | — | 1. FC Köln | Return from loan |
| 01.06.2025 | R. Ache | — | 1. FC Köln | Transfer |
| 01.06.2025 | Í. Bergmann Jóhannesson | Fortuna Düsseldorf | 1. FC Köln | Transfer |
| 03.02.2025 | I. Rondić | Widzew Łódź | 1. FC Köln | Transfer |
| 31.01.2025 | A. Racioppi | — | 1. FC Köln | Loan |
| 30.01.2025 | M. Schmid | 1. FC Köln | — | Transfer |
| 30.01.2025 | M. Wäschenbach | 1. FC Köln | — | Transfer |
| 29.01.2025 | M. Schmid | 1. FC Köln | — | Transfer |
| 28.01.2025 | R. Carstensen | 1. FC Köln | Lech Poznan | Loan |
| 27.01.2025 | J. Urbig | 1. FC Köln | Bayern München | Transfer |
| 13.01.2025 | J. Schmied | FC Sion | 1. FC Köln | Transfer |
| 08.01.2025 | E. Bakatukanda | 1. FC Köln | FC BW Linz | Loan |
| 05.01.2025 | F. Dietz | 1. FC Köln | SCR Altach | Loan |
| 03.01.2025 | S. Adamyan | 1. FC Köln | — | Loan |
| 01.01.2025 | J. Gazibegović | Sturm Graz | 1. FC Köln | Transfer |
| 25.07.2024 | B. Schmitz | 1. FC Köln | Grasshoppers | Free |