Public Expenditure Minister Brendan Howlin has said unions urging their members to vote No to Croke Park II are only offering uncertainty to public servants.
Earlier, four unions - the CPSU, the IMO, the INMO and Unite - said they would not be bound by a majority ICTU vote in favour of the deal.
The four unions exited the Croke Park talks before they ended in February.
Mr Howlin said the savings catered for in the proposed deal were necessary.
He said it was dishonest to say there were no consequences to rejecting the deal, adding the consequences had a wider implication for the Irish economy.
Mr Howlin had promised to say nothing on the proposed Public Service Agreement in order to give workers space and time to decide how they would vote.
But this evening, he said he felt he had to again highlight that savings of €300m are needed from this process this year.