The vaccination portal for 30 to 34 year-olds will open towards the end of next week.
The HSE has also confirmed 18 to 49 year olds will have a choice of vaccine.
The official advice is those age groups should be offered an mRNA option - but can go for a dose of AstraZeneca or Johnson & Johnson if they want an earlier vaccination.
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Health Minister Stephen Donnelly has said the impact of new NIAC recommendations on the vaccine roll-out are not fully known.
He added it's not clear yet what the impact of the Delta variant will be on hospitalisations.
