Transfers
Recent player movements in and out of the squad
| Date | Player | From | To | Type |
|---|---|---|---|---|
| 13.08.2025 | K. Linetty | Torino | Kocaelispor | Free agent |
| 12.08.2025 | C. Keles | Besiktas | Kocaelispor | Loan |
| 04.08.2025 | M. Caktaš | Kocaelispor | — | Free agent |
| 31.07.2025 | B. Yıldız | Kocaelispor | — | Loan |
| 30.07.2025 | B. Yildiz | Kocaelispor | — | Loan |
| 30.07.2025 | M. Wieteska | Cagliari | Kocaelispor | Loan |
| 29.07.2025 | M. Wieteska | Cagliari | Kocaelispor | Loan |
| 25.07.2025 | Pedrinho | Kocaelispor | — | Free agent |
| 25.07.2025 | A. Dijksteel | — | Kocaelispor | Free Transfer |
| 24.07.2025 | A. Dijksteel | — | Kocaelispor | Free agent |
| 23.07.2025 | Serhat Oztasdelen | — | Kocaelispor | Transfer |
| 22.07.2025 | Serhat Oztasdelen | — | Kocaelispor | Transfer |
| 21.07.2025 | B. Alici | Kocaelispor | — | Free agent |
| 15.07.2025 | C. Osmanpaşa | Kocaelispor | — | Free agent |
| 15.07.2025 | F. Özyapı | Kocaelispor | — | Free Transfer |
| 15.07.2025 | B. Petković | Dinamo Zagreb | Kocaelispor | Free agent |
| 14.07.2025 | Furkan Ozyapi | Kocaelispor | — | Free agent |
| 14.07.2025 | H. Sarman | Kocaelispor | — | Free Transfer |
| 13.07.2025 | H. Sarman | Kocaelispor | — | Transfer |
| 13.07.2025 | Furkan Ozyapi | Kocaelispor | — | Free agent |
| 12.07.2025 | E. Gedik | Kocaelispor | — | Free agent |
| 09.07.2025 | M. Haïdara | Stade Brestois 29 | Kocaelispor | Free Transfer |
| 08.07.2025 | J. Nonge Boende | — | Kocaelispor | Free Transfer |
| 04.07.2025 | M. Yılmaz | Kocaelispor | — | Free Transfer |
| 04.07.2025 | J. Nonge Boende | Juventus | Kocaelispor | Free agent |
| 03.07.2025 | M. Yılmaz | Kocaelispor | — | Free agent |
| 03.07.2025 | Show | — | Kocaelispor | Loan |
| 01.07.2025 | H. Sarman | — | Kocaelispor | Back from Loan |
| 01.07.2025 | F. Özyapı | — | Kocaelispor | Back from Loan |
| 01.07.2025 | Marcão | Kocaelispor | — | N/A |
| 01.07.2025 | B. Yıldız | — | Kocaelispor | Back from Loan |
| 01.07.2025 | B. Şen | Kocaelispor | Galatasaray | N/A |
| 01.07.2025 | Ü. Ekşi | — | Kocaelispor | Back from Loan |
| 01.07.2025 | D. Agyei | — | Kocaelispor | Free Transfer |
| 01.07.2025 | M. Haïdara | Stade Brestois 29 | Kocaelispor | Free agent |
| 30.06.2025 | A. Jovanović | FK Partizan | Kocaelispor | Transfer |
| 29.06.2025 | H. Sarman | — | Kocaelispor | Return from loan |
| 29.06.2025 | Marcão | Kocaelispor | — | Return from loan |
| 29.06.2025 | B. Yildiz | — | Kocaelispor | Return from loan |
| 29.06.2025 | U. Eksi | — | Kocaelispor | Return from loan |
| 15.04.2025 | B. Şen | Kocaelispor | Galatasaray | Back from Loan |
| 14.02.2025 | G. Beridze | Kocaelispor | — | Free Transfer |
| 09.02.2025 | R. Rivas | — | Kocaelispor | Transfer |
| 07.02.2025 | R. Rivas | — | Kocaelispor | Transfer |
| 25.01.2025 | B. Şen | Galatasaray | Kocaelispor | Loan |
| 13.01.2025 | S. Yalçın | — | Kocaelispor | Transfer |
| 13.01.2025 | S. Yalçın | — | Kocaelispor | Transfer |
| 13.01.2025 | H. Sarman | Kocaelispor | — | Loan |
| 18.09.2024 | G. Kharaishvili | Kocaelispor | — | Free |
| 13.09.2024 | B. Öksüz | Kocaelispor | — | Free |