His meeting with his British counterpart comes as Taoiseach Micheal Martin travelled to Belfast to meet with Northern Ireland party leaders amid ongoing deadlock at Stormont over the post-Brexit trading arrangements.
Following his meeting with Ms Truss, the Fine Gael minister tweeted: “I made clear Ireland’s opposition to the U.K. breaching international law.
“The UK needs to get back to talks with the EU.”
He earlier said he urged the British Government to “move away” from threats of unilaterally breaching international law and “damaging international relations”.
“EU remains ready to negotiate pragmatic solutions to outstanding Protocol issues through partnership,” Mr Coveney said.
His visit comes in the wake of the UK Government’s controversial move to act unilaterally to scrap parts of the protocol.
Ms Truss announced plans to legislate to override parts of the Brexit withdrawal treaty it struck with the EU.
The DUP is currently blocking the re-establishment of Stormont’s powersharing institutions in protest at the protocol, which has created economic barriers on trade between Great Britain and Northern Ireland.
Mr Coveney later met with his German counterpart Annalena Baerbock in Turin on Friday.
“I thanked her for her statements and that of the Chancellor, standing up for international law and the Brexit deal,” Mr Coveney said following his meeting.
“The EU is ready to find solutions in response to the concerns of Unionism in NI but needs a partner at the table.”