| 28. Jornada | 24.04.2021 | NK Dugopolje | - | NK Opatija | 0:0 |  |
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| 31. Jornada | 12.05.2021 | NK Opatija | - | NK Kustošija | 0:0 | ||||
| 32. Jornada | 16.05.2021 | NK Croatia Zmijavci | - | NK Opatija | 1:3 |  |
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| 33. Jornada | 23.05.2021 | Dinamo Zagreb II | - | NK Opatija | 2:2 | ||||
| 34. Jornada | 29.05.2021 | NK Opatija | - | NK BSK Bijelo Brdo | 2:2 |
Croacia