A meeting between civic nationalist group Ireland's Future and Leo Varadkar has been described as a "very positive engagement".
A delegation representing the group met the taoiseach in Dublin on Thursday.
It came ahead of the Fine Gael leader restating his belief that there would be a united Ireland in his lifetime.
Ireland's Future CEO Gerry Carlile told The Irish News that it was the group's expectation that there would be a border poll within a decade.
"We outlined the reasons why we believe a unity referendum is on the horizon and why the British government will probably be obliged to call a referendum to be held around the year 2030," he said.
"We discussed the period of planning and preparation that would be required and we made some suggestions that we hope the taoiseach and the government found useful."
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The discussions also covered the current suspension of the devolved institutions and the British government's legacy bill, which completed its passage through Westminster earlier this week.
"We discussed the current stasis at Stormont and there was very clear agreement in the room that the executive should be reinstated immediately," Mr Carlile said.
"We discussed the cost of living crisis and the decline in the quality of public services in the north and we set all of that in the context of the ever growing conversation on a unity referendum."
The Ireland's Future CEO described the meeting as "productive".
"It was a very positive engagement and as we progress through this period of immense change across the island, we hope to continue to meet both the taoiseach and government officials on a continuous basis in the time ahead," he said.
