The Deputy Chief Medical Officer, Dr Ronan Glynn, will warn politicians tomorrow of the "considerable risk" of another wave of Covid infection if restrictions are eased too quickly.
Dr Glynn will tell the Oireachtas Health Committee that significant progress is being made in controlling the disease and in rolling out vaccines.
However, he says the level of infection remains high with a much more transmissible virus and the number of people fully protected through vaccination remains low.
In his opening statement to the committee, seen by RTÉ News, Dr Glynn says the National Public Health Emergency Team's advice to Government continues to recommend a cautious approach.
He says that any further easing of measures should be gradual and phased and should allow adequate time between phases to assess the impact.
"The priority must remain on maintaining control over the disease, until vaccination can offer a widespread population level of protection."
NPHET will continue to monitor the epidemiological situation closely over the coming weeks to assess the impact of the reopening of priority services and those measures that have been eased.
Dr Glynn says there are more reasons to be hopeful than at any time during the pandemic due to the vaccination roll-out, the decrease in the trajectory of the disease and the resumption of priority public services like schools.