It's now "all hands on deck" to speed up the booster vaccine campaign, the Taoiseach and Health Minister have said.
Pop-up vaccination centres and longer opening hours for existing clinics are among the measures being considered to speed up the rollout.
It's also expected that hundreds of health care staff are to be redeployed to help accelerate the programme.
Currently, anyone aged over 50 is eligible for a booster vaccine, but that's set to be extended to all over 40s shortly.
Meanwhile, people are now eligible for a booster three months after their second dose - a major change from the previous five-month interval.
It comes amid growing concern over the Omicron variant, which health officials believe now accounts for around 11% of new cases in Ireland.
On his way into today's Cabinet meeting, Taoiseach Micheál Martin thanked everybody involved in administering boosters to date.
He said: “We need everybody on board now - all hands on deck in relation to the booster campaign, because Omicron is of serious concern.
“There’s ongoing engagement now, to get as many GPs involved… and to get more pharmacies involved. I think that is critical.”
He also praised the public for 'adjusting their behaviour' in recent weeks - saying that has helped stabilise hospital numbers and daily case rates.
Stephen Donnelly, meanwhile, said Government's “working very hard” with HSE on the ongoing booster programme.
The Health Minister says this follows “very sobering advice” around the transmissibility of Omicron, but also early research showing how important the booster shot is in protecting against the new variant.
He said: “It really is all hands on deck to get as many people boosted as quickly as possible.
“We’re looking at how we can support GPs and pharmacists in doing as many boosters as possible, and how we can open up the vaccine clinics as much as possible.
"Can we have more pop-up vaccine centres? We’re looking at options around scheduling, and times during the week where there seems to be less or more demand."
He added that it's “absolutely essential” that people get their boosters when they can, as the extra protection offered is "very, very significant".