The vaccine portal will begin opening for 35 to 39-years-old from Sunday.
Registrations will be open 39-year-olds on Sunday and 38-years-old on Monday, with the age then dropping by a year each day until Thursday.
📢📢🚨 Delighted to announce for some of you under 40s - the registration for a COVID-19 vaccine will open to those aged 35-39 on Sunday.
— Stephen Donnelly (@DonnellyStephen) June 17, 2021
According to the last official vaccine update, on Wednesday, June 9th, Ireland had administered 3.1 million vaccine doses.
Some 57% of the adult population had received their first dose with just over one-quarter fully vaccinated.
Pharmacists today began offering the Johnson & Johnson vaccine to people over the age of 50 who have yet to get the jab.
Meanwhile, a study from the ESRI Behavioural Research Unit has suggested that COVID-19 vaccine hesitancy may be down to a "lack of knowledge" about the jabs rather than anti-vaccination belief.
Researchers asked a sample of the general population to carry out a series of tasks - including a multiple-choice quiz about the effectiveness of the vaccines and the development process.
Those planning to take the vaccine got an average score of 67%.
The result dropped to 50% for those who were unsure, and only 37% for those planning not to take it.
Participants were also asked to list what they thought were the benefits and risks of the vaccines.
Only 5% of those planning not to take the vaccine and around 50% of those who were unsure listed any benefit at all.