The Taoiseach says as it stands the UK will leave the EU on April 12th without a Brexit deal - but there's still time for Theresa May to come up with alternatives.
Leo Varadkar is in Paris today for talks with Emmanuel Macron, who today said the EU will never abandon Ireland.
It comes as the British Prime Minister has held hours of talks with her top team - trying to work out how to proceed with Brexit.
A group of senior MPs from various parties have tabled a bill trying to block a no-deal exit.
However, the British government only has until the end of next week to come up with a plan - with EU leaders to meet next Wednesday to discuss the situation.
Speaking before a meeting with the French President, Leo Varadkar said Theresa May can still come up with a convincing plan.
He argued: "As things stand, the United Kingdom will leave the European Union on April 12th without a deal.
"However, there is still time to come to the European Council with proposals - proposals that are credible, and have a clear pathway to success.
"I think we need to be open to any proposals that she may bring forward to us".
— Leo Varadkar (@LeoVaradkar) April 2, 2019
Mr Macron, meanwhile, insisted the EU will never abandon Ireland.
He said that it's up to the UK to come up with alternative proposals.
He called on them to come up with options "now" - warning that a potential long extension to the Brexit process should not be taken for granted.