The fiscal treaty remains on course to be passed in next week's referendum, according to the latest opinion poll.

The Ipsos/MRBI poll for tomorrow's Irish Times shows that the Yes side has gained slightly more support in the past five weeks than the No side, as undecided voters make up their minds.

Ipsos/MRBI conducted this poll among 1,000 voters around the State between lunchtime on Wednesday and lunchtime today.

Since the last Irish Times poll five weeks ago, support for the treaty has increased by nine points to 39%, while the No vote is up seven points to 30%. 31% remain undecided or say they will not vote, down 16 points in five weeks.

When undecided voters are excluded, Yes leads by 57% to 43% - almost exactly the same proportion as in the last Irish Times poll.

Earlier today, Fianna Fáil leader Micheál Martin said he believes the campaign to achieve a Yes vote is relatively strong.

He said he has met far more people who are definitely planning to vote Yes than people who will vote No.

Mr Martin said there are still a significant number of undecided voters and that his party will be targeting that group in the last week of canvassing.

Speaking as he conducted a canvass in Ennis in Co Clare, he said there are now quite a diverse number of groups campaigning for a No vote.

He said he believed that they are an un-coordinated group and that that may well help the Yes campaign, as many of them have very different agendas, including very different political agendas.

He said the fiscal treaty is an important first step in that it gives Ireland access to a secure source of funding at affordable rates.

Elsewhere, the Labour Party erected Yes posters for the fiscal treaty outside a Sinn Féin premises in Parnell Square in Dublin.

The posters claim Sinn Féin got it wrong in supporting the bank guarantee scheme in 2008 and that it is wrong now in calling for a No vote.

Labour TD Dominick Hannigan erected the posters on a lamp post and narrowly avoided an accident when his ladder slipped as he stepped off it.

Responding to questions about the posters, Sinn Féin leader Gerry Adams said that austerity is not working, that the referendum result was still all to play for and that the country could not cut its way to growth.

Mr Adams said that he intends to lead his party into the next general election and that his leadership of Sinn Féin was not an issue.

He was speaking at the start of the party's Ard Fheis in Killarney.

Meanwhile, the Campaign against Household and Water Charges has called for a No vote next Thursday.

The Communist Party of Ireland has also called for a No vote.