70 per cent of the adult population should be fully vaccinated by the end of July, according to the Taoiseach.
30 to 39 year olds are expected to be able to register for their jab next week.
Cases of Covid-19 will drop significantly once over-30s are vaccinated, according to a former head of the HSE.
The HSE says the online portal will open 'shortly' for this age-group, as people in their 40s continue to be offered appointments.
Tony O'Brien says it's vital people in their 30s are vaccinated soon.
Over 3.1 million vaccines have been administered so far - with registration still open for 40 to 69 year olds.
Micheál Martin says Ireland is in a good position: