Sinn Féin has lost support, according to a new opinion poll, but remains the country's most popular party.

The Red C poll for the Business Post suggests Sinn Féin's support has dropped by four points, after more than a year of strong polling results.

The survey also suggests that Fine Gael has increased its support by three points and is significantly ahead of Fianna Fáil which lies in third place.

The poll puts Sinn Féin on 31%, down four, but Fine Gael on 24%, which is up three.

Fianna Fáil is down one at 15% support.

Green Party support is up marginally to 5% - up one.

Both Labour Party and the Social Democrats are unchanged at 4%.

People Before Profit / Solidarity is unchanged at 3%, while Aontú is up one at 2%.

Independents are unchanged at 11%.

Red C interviewed more than 1,000 voters for their online poll, between Friday 18 November and Wednesday 23 November.

The margin of error in the poll is plus or minus 3%.