Fianna Fáil MEP Billy Kelleher said he raised the issue of relaxing Covid-19 rules governing their return to Ireland from Belgium or France before the controversy over the Oireachtas Golf Society Event in Clifden last month.
Speaking on RTÉ's Today with Claire Byrne, Mr Kelleher said he has since written another letter highlighting the challenges faced by MEPs.
He said: "We can fly from Brussels and go about our parliamentary business, but when we fly back we have to self-isolate for 14 days." Mr Kelleher said while some work can be carried out remotely, MEPs cannot participate in plenary sessions if they are not physically in parliament, which would be the same as saying TDs cannot go to the Dáil.