The Taoiseach will join other European leaders in Brussels today as efforts continue to choose a new European Commission President.
They'll be hoping to break a political impasse after failing to reach an agreement earlier this month during late night talks.
While other key roles will also be filled over the coming months, the Commission presidency is a key focus - as the candidate to replace Jean-Claude Juncker needs a qualified majority from the European Council and an absolute majority in the European Parliament.
Leo Varadkar will be joined by European Affairs Minister Helen McEntee in Brussels today.
In a statement ahead of the special summit, the Government said: "It was agreed [at the last meeting] that compromises will be needed in order to achieve the necessary gender, political, geographic and demographic balance.
"It is also important that suitable and qualified people fill those posts, who have an understanding of Ireland’s issues and concerns, including in relation to Brexit."
European Council President Donald Tusk, who called today's meeting, said candidates must "reflect geographical balance as well as demography, so that both large and smaller countries are represented in the highest positions in the EU".
I continue my consultations on appointments ahead of this evening’s #EUCO. Good to meet @CiolosDacian and @guyverhofstadt this morning. pic.twitter.com/BbEocn7TSL
— Charles Michel (@eucopresident) June 30, 2019
Mr Tusk has called on leaders to work towards choosing nominees for the top EU roles in June.
However, with only a half-day remaining in June and talks likely to continue late into the night, it could be July before we hear how the latest negotiations have gone.
The schedule for today's summit - which only gets underway from 6pm Brussels time - already states "if necessary, the meeting may continue with a breakfast on 1 July 2019".
The European Parliament has called for the top European Commission role to go to leader of the biggest European-level political group - which in this case would be the European People’s Party’s Manfred Weber.
Mr Weber has the backing of the German Chancellor Angela Merkel.
However, French President Emanuel Macron is believed to favour Brexit negotiator Michel Barnier.
Other potential candidates include the current competition commissioner Margrethe Vestager, from the EU's liberal bloc, and Frans Timmermans from the Party of European Socialists.
Some commentators have listed Leo Varadkar as a possible alternative EPP candidate - however, the Taoiseach responded by saying he's 'flattered' but already has a job.
