The European Commission has agreed with Pfizer for 10 million more vaccines to be delivered to member states in quarter two of this year.
The consignment will be taken from the promised delivery due in the Autumn.
It's expected to mean an extra 100,000 doses for Ireland in the second quarter.
Meanwhile, the World Health Organisation is investigating the safety of the AstraZeneca vaccine at a special meeting today.
It comes after several countries, including Ireland, temporarily suspended the rollout of the drug following reports of "blood clots".
The European Medicines Agency is also meeting today with a decision expected to be made on the AstraZeneca vaccine on Thursday.
The number of people in hospitals with Covid-19 has fallen after increases over the past two days.
355 patients with the virus are being treated in public hospitals today- with 85 of these patients in ICU.
This includes 21 Covid patients at Mayo University Hospital - down from 23 yesterday - with 7 at Galway University Hospital at 5 at Sligo University Hospital.