There has been a rise in support for the fiscal treaty referendum, a new poll has found.

The Red C poll of 1,000 people around the country found that 53% of voters say they will vote Yes - an increase of six points on the last poll a fortnight ago.

31% say they will vote No, down four points, while 16% are undecided, down two points.

When the undecided are excluded, the Yes side leads by 63% to 37% with just under three weeks to go until voting.

In terms of party support, the poll showed that Fine Gael has dropped three points to 29%, while coalition partner Labour is down to 13%. 

Fianna Fáil is up two to 19%, while Sinn Féin is also up two to 21% - the party's highest ever Red C rating. Independents and others are unchanged at 18%.

Earlier today, Tánaiste Eamon Gilmore warned that the political turmoil in Greece could be repeated in Ireland if the treaty is rejected.

Mr Gilmore and Finance Minister Michael Noonan said the Government was not considering delaying the ratification of the treaty in the event of a Yes vote.

Responding to Mr Gilmore’s comments about the potential impact of a No vote, Socialist Party leader Joe Higgins said that the problems of Greece are caused by the disastrous effects of austerity.

“To persist with an austerity treaty that is becoming increasingly discredited and deconstructed would be foolhardy,” he said.

Canvassing in Dublin Sinn Féin’s Gerry Adams said the treaty was based on the same failed policies as the current Government strategy.

“If implemented it will deepen the recession and make it more difficult to tackle the unemployment crisis,” he said.

"A comprehensive rejection of the Austerity Treaty on May 31st would send a powerful signal to the Government that a change of direction is needed,” Mr Adams added.

Fianna Fáil leader Micheál Martin has said that Germany's delay in ratifying the fiscal treaty may create some doubt initially in people's minds but he said clarity would come from the meeting between Francois Hollande and Angela Merkel and the informal EU summit.

He said Angela Merkel was absolutely clear that the treaty had to be passed.

Mr Martin added that the election of Mr Hollande as French President had given the growth agenda new impetus.