Speaking in Dublin before the historic devolution ceremony began, the party’s environment spokesman Eamon Gilmore said differences on economic matters and outlook made the parties incompatible.
Mr Gilmore also said that the media emphasis on the Taoiseach’s finances meant other issues were ignored.
He said the principal issue coming up was health. His comments seemed to suggest a nervousness that it may prove counter-productive for FG and Labour if the focus remains on the so-called BertieGate controversy during the campaign — FF benefited from a significant upswing of support last October as a result of sympathy for the Taoiseach’s situation.
Labour’s director of elections James Wrynn said the party was confident of retaining its 21 seats, while a number of seats in marginal constituencies were strong targets.
Possible gains include Cork South Central, Dublin South, Dublin Mid West, Cork South West and Kerry North, he said. Mr Wrynn also said Labour had a real chance of taking second seat in Dun Laoghaire and Dublin South Central.