One of the country's teaching unions has vowed to fight the new public pay deal which would have secured a 2,000 euro wage hike.
The Teachers' Union of Ireland revealed it wants its members to reject the agreement in a dispute over working hours and bureaucracy imposed at the height of Ireland's economic crisis.
A ballot is to be held in the autumn.
The three-year pay deal, struck only last Friday, is designed as the first steps in wage restoration for public servants and will cost the State 566 million euro.
TUI president Gerry Quinn said that the plan, known as the Lansdowne Road Agreement, fails to allay significant concerns over work-related stress of lecturers, additional hours for teachers and the bureaucracy facing secondary teachers.
"Research has demonstrated that our members in institutes of technology are experiencing high levels of work-related stress as a result of the additional 'flex' hours given for the duration of the Haddington Road Agreement," he said.
"The delivery of these two hours of lecturing requires a multiple of hours in terms of preparation and associated work. This imposition is disproportionate, unfair and unsustainable.
"It is completely unacceptable to lecturers that it would continue as part of the new proposals."
The new pay deal is aimed mainly at workers earning less than 60,000 euro.
"At second level, teachers are frustrated and disillusioned by the extra hours of bureaucracy and administration required under the Croke Park and Haddington Road Agreements," he said.
"Again, it is completely unacceptable that they would form part of any future agreement."
The pay deal next year aims to bring in a 1,003 euro pay rise for the lowest earning workers on up to 30,000 euro and 733 euro for middle to high earners on up to 60,000 euro and 100,000 euro.
In 2017, the increases work out at 567 euro for workers earning up to 30,000 and 60,000 euro and 267 for workers on the scale up to 100,000 euro.
The final tranche of wage hikes will see workers in the lowest bracket up to 30,000 get an additional 600 euro and those in the mid-range get 595 euro and those on the highest salaries get no additional rises.
The Association of Higher Civil and Public Servants union said its members had been treated in an "inequitable manner".
The Impact trade union, one of the biggest in the talks, is expected to announce its support for the deal this week.
Impact said its members would be balloted next week.
Its executives said the deal achieved the essential objective of fairness by taking a flat-rate approach to pay restoration and was the first step forward on public servants' pay since emergency cuts were brought in six years ago.