Transfers
Recent player movements in and out of the squad
| Date | Player | From | To | Type |
|---|---|---|---|---|
| 26.02.2026 | D. Ceylan | Kocaelispor | Kocaelispor | - |
| 31.01.2026 | E. Bilim | Kocaelispor | — | Loan |
| 30.01.2026 | Mahamadou Susoho Sissoho | Manchester City | Kocaelispor | Transfer |
| 29.01.2026 | Mahamadou Susoho Sissoho | Manchester City | Kocaelispor | Transfer |
| 27.01.2026 | O. Syrota | Kocaelispor | Dynamo Kyiv | Return from loan |
| 01.01.2026 | T. Serbest | Kocaelispor | — | Free agent |
| 30.12.2025 | T. Serbest | Kocaelispor | — | Free agent |
| 25.11.2025 | B. Dalkilic | Kocaelispor | — | - |
| 24.11.2025 | B. Dalkilic | Kocaelispor | — | - |
| 01.11.2025 | E. Lawal | Kocaelispor | — | Free agent |
| 01.11.2025 | E. Lawal | — | Kocaelispor | Return from loan |
| 01.11.2025 | Toheeb Lawal | Kocaelispor | — | Free agent |
| 01.11.2025 | Toheeb Lawal | — | Kocaelispor | Return from loan |
| 12.09.2025 | H. Keïta | Clermont Foot | Kocaelispor | Loan |
| 11.09.2025 | Ryan Mendes | Kocaelispor | — | Transfer |
| 11.09.2025 | H. Keïta | Clermont Foot | Kocaelispor | Loan |
| 11.09.2025 | S. Dursun | — | Kocaelispor | Free Transfer |
| 10.09.2025 | C. Çelik | Kocaelispor | — | Free Transfer |
| 10.09.2025 | Ryan Mendes | Kocaelispor | — | Transfer |
| 10.09.2025 | S. Dursun | — | Kocaelispor | Free agent |
| 09.09.2025 | M. Caktaš | Kocaelispor | — | Free agent |
| 09.09.2025 | Ryan Mendes | Kocaelispor | — | Transfer |
| 09.09.2025 | C. Çelik | Kocaelispor | — | Free agent |
| 09.09.2025 | A. Appindangoyé | Kocaelispor | — | Free Transfer |
| 09.09.2025 | S. Dursun | — | Kocaelispor | Free agent |
| 08.09.2025 | C. Çelik | Kocaelispor | — | Free agent |
| 08.09.2025 | A. Appindangoyé | Kocaelispor | — | Free agent |
| 08.09.2025 | B. Balogh | Parma | Kocaelispor | Loan |
| 07.09.2025 | B. Balogh | Parma | Kocaelispor | Loan |
| 07.09.2025 | A. Appindangoyé | Kocaelispor | — | Free agent |
| 06.09.2025 | H. Smolčić | Eintracht Frankfurt | Kocaelispor | Loan |
| 05.09.2025 | M. Tunalı | Kocaelispor | — | Loan |
| 05.09.2025 | H. Smolčić | Eintracht Frankfurt | Kocaelispor | Loan |
| 04.09.2025 | M. Tunalı | Kocaelispor | — | Loan |
| 02.09.2025 | A. Göcen | Kocaelispor | — | Free Transfer |
| 01.09.2025 | D. Churlinov | Burnley | Kocaelispor | Transfer |
| 31.08.2025 | D. Churlinov | Burnley | Kocaelispor | Transfer |
| 31.08.2025 | O. Çağlayan | Kocaelispor | — | Transfer |
| 30.08.2025 | O. Çağlayan | Kocaelispor | — | Transfer |
| 29.08.2025 | O. Oztonga | Kocaelispor | — | Loan |
| 28.08.2025 | Ü. Ekşi | Kocaelispor | — | Free Transfer |
| 26.08.2025 | M. Çil | Kocaelispor | — | Loan |
| 26.08.2025 | J. Vuković | Kocaelispor | — | Free agent |
| 26.08.2025 | U. Eksi | Kocaelispor | — | Free agent |
| 22.08.2025 | O. Syrota | Dynamo Kyiv | Kocaelispor | Loan |
| 22.08.2025 | T. Bingöl | Besiktas | Kocaelispor | Free Transfer |
| 21.08.2025 | O. Syrota | Dynamo Kyiv | Kocaelispor | Loan |
| 21.08.2025 | T. Bingöl | Besiktas | Kocaelispor | - |
| 14.08.2025 | K. Linetty | Torino | Kocaelispor | Free Transfer |
| 13.08.2025 | K. Linetty | Torino | Kocaelispor | Free agent |