| 10. Jornada | 17.10.2020 | NK Junak Sinj | - | NK Opatija | 0:2 | ||||
| 12. Jornada | 30.10.2020 | NK Međimurje | - | NK Opatija | 3:0 | ||||
| 11. Jornada | 14.11.2020 | NK Opatija | - | NK Dugopolje | 2:1 | ||||
| 14. Jornada | 21.11.2020 | NK Kustošija | - | NK Opatija | 2:1 | ||||
| 13. Jornada | 25.11.2020 | NK Opatija | - | NK Inter Zaprešić | 3:2 |  |
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| 16. Jornada | 05.12.2020 | NK Opatija | - | Dinamo Zagreb II | 2:1 | ||||
| 19. Jornada | 20.02.2021 | NK Opatija | - | NK Sesvete | 1:0 | ||||
| 21. Jornada | 06.03.2021 | NK Opatija | - | NK Rudeš | 0:0 | ||||
| 22. Jornada | 14.03.2021 | HNK Cibalia | - | NK Opatija | 2:0 | ||||
| 23. Jornada | 20.03.2021 | NK Opatija | - | NK Dubrava | 2:1 |
Croacia