The rollout of Covid-19 vaccines to people over 70 "may well be slower" than originally planned, the Tanaiste has said.
It comes after the National Immunisation Advisory Committee (NIAC) recommended that people aged 70 and over should only receive mRNA vaccines - from Pfizer/BioNTech or Moderna - where possible.
It means the AstraZeneca vaccine will now be given to healthcare workers and vulnerable people under the age of 70, Leo Varadkar told the Dail.
Speaking during Leader's Questions, Mr Varadkar said he could not give exact dates for the new rollout schedule, but confirmed it would take longer than planned.
Minister for Health Stephen Donnelly said he has signed the authorisation for use of the AstraZeneca vaccine.
Mr Donnelly said it will be used by Ireland's vaccinators immediately.
"The first delivery of this vaccine is due next week," he tweeted.
"Ireland now has three safe and effective vaccines."