Opatija (First NL): every transfer in and out, fees paid and earned, squad market value.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-07-27 | Roko Domjanic | NK Varazdin | Opatija | Loan |
| 2026-02-06 | Nino Stojanovic | Opatija | Velez | Free |
| 2026-02-02 | Emanuel Mađarić | Stupčanica Olovo | Opatija | Free |
| 2025-09-04 | Gabriel Groznica | Ferizaj | Opatija | Free |
| 2025-08-12 | Matej Mršić | Podbeskidzie | Opatija | Free |
| 2025-08-11 | Vedran Dalić | Bijelo Brdo | Opatija | Free |
| 2025-08-07 | Ricardo Bagadur | Orijent 1919 | Opatija | Free |
| 2025-08-06 | Sebastian Lesjak | Opatija | ND Gorica | Free |
| 2025-07-14 | Ivan Graf | Opatija | Kustošija | Free |
| 2025-07-02 | Tomislav Glavan | Opatija | NS Mura | Free |
| 2025-07-01 | Dominik Mulac | Opatija | Kazincbarcika | Free |
| 2025-02-25 | Florent Shehu | Adana Demirspor | Opatija | Free |
| 2024-09-02 | Sebastian Lesjak | Tolmin | Opatija | Free |
| 2024-07-22 | Dominik Mulac | Orijent 1919 | Opatija | Free |
| 2024-07-18 | Tomislav Glavan | NK Istra 1961 | Opatija | Free |
| 2023-01-18 | Marijan Coric | Opatija | NK Istra 1961 | Free |
| 2022-08-31 | Aleksandar Georgiev | HNK Rijeka | Opatija | Free |
| 2022-08-09 | Marijan Coric | KF Llapi | Opatija | Free |
| 2022-08-04 | Marin Belancic | Opatija | Hrvatski Dragovoljac | Free |
| 2022-07-01 | Baltazar Anton Bogolin | Opatija | Free |