SINN Féin MEP Martina Anderson wore footballer James McClean's Ireland jersey during a debate in the European Parliament.
She donned the Republic of Ireland football shirt given to her by the Derry-born midfielder for a Brexit discussion in Strasbourg yesterday morning.
McClean, who also plays for Stoke City, had worn the jersey for the Republic of Ireland's 2-0 European qualifying victory over Gibraltar on June 10 at the Aviva Stadium in Dublin.
Holding her Irish passport in the air, Ms Anderson was addressing the parliament during a discussion on the UK's exit from the EU.
She expressed her concerns about how a disorderly Brexit might impact Irish people living in the north of Ireland.
"My Irish passport says that it is the entitlement and birthright of everyone born on the island of Ireland to be part of the Irish nation," she said.
"As this resolution clearly states we Irish in the north of Ireland are therefore entitled to EU citizenship where we reside.
"Whilst the backstop is essential to prevent a hardening of the border partitioning Ireland, to protect the All-Ireland economy and North-South cooperation it takes us out of the EU against our will, we in the north of Ireland voted to remain."
Her statement came after the EU’s chief Brexit negotiator Michel Barnier and outgoing European Commission President Jean-Claude Juncker provided MEPs with an update on the progress made on Brexit.
There is no dress code or restriction on messages on clothing for the European Parliament.
In 2014, a row broke out at Belfast City Council after former DUP councillor Ruth Patterson put on a Linfield football scarf while speaking during a council debate.
She stood up to speak in her supporter's scarf as she proposed an event at city hall to recognise the achievements of Linfield manager David Jeffrey.
But Sinn Féin objected to her actions, with Jim McVeigh from the party querying if it was appropriate for Ms Patterson wear a football scarf in the workplace.
