The first political opinion poll of the New Year shows Fine Gael maintaining a five point lead over Fianna Fáil, although support for both parties has dropped slightly.

The Greens made the biggest gains in the Red C poll for tomorrow's Sunday Business Post.

Support for Fianna Fáil has dropped two points, to 28%, since the last Red C poll in November.

Fine Gael support is also down two to 33%, but it retains a five point lead over the main Government party.

Labour are unchanged at 14%, while the Greens, after a week of high-profile resignations and criticism of the leadership, have seen their support almost double - up three to 8%.

Sinn Féin gain one to 9%, while Independents and others are unchanged at 8%.

58% of those polled said they would support the Lisbon Treaty, compared to 28% who said they would not, with 14% undecided. These results represent a two to one majority for the Yes side.