Taoiseach Enda Kenny has warned his party members to raise their concerns over the forthcoming budget at internal committee meetings.
Eight Fine Gael TDs have asked a series of questions about the Croke Park agreement in a newspaper and said increments and allowances for higher earning civil servants should be up for negotiation.
Mr Kenny said the Government is already examining what can be achieved through talks with the implementation body overseeing the pay deal.
"But clearly my preference is for deputies to air these matters in the parliamentary party or internal committee meetings," he added.
In an unprecedented move the eight co-authored an article in the Irish Examiner and challenged the Government on the pay deal.
The TDs are Sean Conlan, Paul Connaughton, Pat Deering, Brendan Griffin, Noel Harrington, Sean Kyne, Anthony Lawlor, and Eoghan Murphy.
Elsewhere, Labour rebels claim to have support in their parliamentary party for their calls for a wealth tax in the budget.
Mr Kenny stressed December's budget is a matter for the Government, but claimed it had not yet discussed any of these matters being raised.
He said: "Next week we will have an economic debate in the Dail. Every member will have the opportunity to say their piece on issues that concern them for the budget.
"Ministers will set out the general parameters in which the budget has to be drafted and, as I said last week, I look forward to the contributions of all and sundry, particularly constructive propositions that people may well have to make."