A senior former Fine Gael strategist says it is the party's "destiny" to end up in government with Fianna Fáil.
Frank Flannery says he thinks it is inevitable that the two right-wing parties will end up having to share power.
Mr Flannery, who resigned as a Fine Gael trustee in March, says the combined vote for the two parties is not high enough for either to govern alone.
Speaking at the MacGill Summer School in Glenties, Mr Flannery said the two parties would have no issues getting together.
He said: "It is the destiny of Fine Gael and Fianna Fáil, increasingly to come together, whatever form that will take. To stay in power, and to exercise their power, I think the votes and the voters are telling the parties that that is what should happen.
"And they are also telling Labour and Sinn Féin to do likewise."