Fianna Fáil MEP Billy Kelleher has apologised after failing to self-isolate for 14-days after arriving in Ireland.
Mr Kelleher travelled from Brussels last Friday, ahead of the election of Micheál Martin as Taoiseach in Dublin the following day.
The Ireland South MEP attended Mr Martin's election, but has now acknowledged he didn't self-isolate beforehand.
In a statement, he said: "As I previously stated, I avail of COVID-19 testing services before in advance of departing Brussels in order to reduce any potential public health risk.
"However, despite this, I accept that the risk could not have been eliminated fully and I should have followed HSE advice and remained at home.
"This was an error of judgement on my part and I apologise unreservedly."
Currently, anyone arriving in Ireland for abroad has to fill out a form detailing where they will be self-isolating.
They are then advised to self-isolate for two weeks, although it is not a legal requirement to do so.
