The Taoiseach and British Prime Minister are to speak next week.
The discussion, over the phone, will take place ahead of a G7 summit of world leaders in France.
A face-to-face meeting between the pair is still in the process of being arranged, with a date expected some time in September.
It comes as some UK MPs continue attempts to block the possibility of a 'No Deal' Brexit, with a unity government the latest idea being put forward.
Former Political Editor of The Times, Philip Webster, explains how it would work: