| 28. Round | 24/04/2021 | NK Dugopolje | - | NK Opatija | 0:0 |  |
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| 31. Round | 12/05/2021 | NK Opatija | - | NK Kustošija | 0:0 | ||||
| 32. Round | 16/05/2021 | NK Croatia Zmijavci | - | NK Opatija | 1:3 |  |
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| 33. Round | 23/05/2021 | Dinamo Zagreb II | - | NK Opatija | 2:2 | ||||
| 34. Round | 29/05/2021 | NK Opatija | - | NK BSK Bijelo Brdo | 2:2 |
Croatia