| 13. Jornada | 25.11.2020 | NK Opatija | - | NK Inter Zaprešić | 3:2 |  |
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| 15. Jornada | 28.11.2020 | NK Opatija | - | NK Croatia Zmijavci | 2:3 | |
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| 16. Jornada | 05.12.2020 | NK Opatija | - | Dinamo Zagreb II | 2:1 |  |
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| 18. Jornada | 12.02.2021 | Hajduk Split II | - | NK Opatija | 2:2 | ||||
| 20. Jornada | 27.02.2021 | NK Solin | - | NK Opatija | 1:1 | ||||
| 23. Jornada | 20.03.2021 | NK Opatija | - | NK Dubrava | 2:1 | ||||
| 24. Jornada | 02.04.2021 | HNK Orijent Rijeka | - | NK Opatija | 4:1 | |
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| 32. Jornada | 16.05.2021 | NK Croatia Zmijavci | - | NK Opatija | 1:3 | |
Croacia