Ireland is set to receive another 3.3 million doses of the Pfizer/BioNTech vaccine under a new EU deal.
The positive move comes on top of the original 2.3 million that was announced by Health Minister Stephen Donnelly in December.
The European Union has since extended its contract with the two pharmaceutical giants, leading to a more extensive rollout.
Commission President Ursula von der Leyen explained that the EU would be purchasing another 300 million doses of the jab, doubling the original number to 600 million.
But the delivery of the second batch will not take place until the second half of 2021.
A statement on behalf of the Commission said: "The European Commission today proposed to the EU Member States to purchase an additional 200 million doses of the Covid-19 vaccine produced by BioNTech and Pfizer, with the option to acquire another 100 million doses.
"This would enable the EU to purchase up to 600 million doses of this vaccine, which is already being used across the EU.
"The additional doses will be delivered starting in the second quarter of 2021.
"The EU has acquired a broad portfolio of vaccines with different technologies. It has secured up to 2.3 billion doses from the most promising vaccine candidates for Europe and its neighbourhood.
"In addition to the BioNTech-Pfizer vaccine, a second vaccine, produced by Moderna, was authorised on 6 January 2021. Other vaccines are expected to be approved soon.
"This vaccine portfolio would enable the EU not only to cover the needs of its whole population, but also to supply vaccines to neighbouring countries."
