The executive of the Teachers' Union of Ireland (TUI) is recommending rejection of the new national partnership deal agreed on Wednesday.
Meanwhile, talks on the agriculture element of partnership broke up last night without agreement.
They were expected to be concluded this weekend but will resume next week as farm groups seek a seven-year funding package of over €1 billion a year.
With reform of EU funding taking dramatic effect from next year, new means of farm supports and rural development is under discussion. It is understood the Government is offering a package of around €5.5 billion.
Farmers bodies are thought to looking for around €2 billion more.
Irish Creamery Milk Suppliers Association president Jackie Cahill said a "further response from Government was required to properly finance an envisaged seven-year Farm Development Programme."
He also supported the view that a deal will be struck by early next week but the move by the TUI executive could prove more destabilising to a partnership deal agreed after protracted negotiations.
The executive rejected the 10 per cent pay rise over 27 months on offer saying it does little more than keep pace with inflation.
The union's president, Paddy Healy, said there would be considerable change in work practices and arrangements within the education sector without any guarantee of additional resources.
The challenges facing second-level teachers such as increasing disciplinary problems and special needs requirements were pushing teachers to "breaking point".
Lecturers at Institutes of Technology were effectively forced into a process of change under the deal because pay increases could be withheld if agreement was not reached with their employers, Mr Healy added.
"TUI is opposed to changes in conditions of service and increased workload being imposed on members in return for national pay rounds which principally compensate for inflation," Mr Healy said.
He also criticised the education provision under the 10-year plan for social provision.
The executive unanimously agreed to recommend members reject the agreement at a special congress to be held tomorrow week.
The membership will need to ratify the executive's position in a postal ballot following the meeting before it become union policy.