The National Immunisation Advisory Committee is today expected to recommend the Johnson and Johnson vaccine be used on people over 50.
NIAC is also likely to say it can be used on under-50s if another vaccine is not available.
The European Medicines Agency says the one-shot jab has a possible link to rare blood clots, but the benefits outweigh the risks.
Meanwhile, 151 Covid-19 patients were in public hospitals last night - the lowest in over 200 days.
The figure dropped by 22 in 24 hours, to its lowest since October 6th, while there are 46 in intensive care.
437 new cases were reported yesterday, along with one death.
On Thursday the government will announce what restrictions will ease over the coming months.