Taoiseach Leo Varadkar has warned that gaps still remain between the EU and the UK over Brexit.
He said while there has been progress in the Brexit negotiations "nothing is agreed until everything is agreed".
Mr Varadkar was speaking following a meeting with Germany's Chancellor Angela Merkel in Berlin on Tuesday.
This was his first visit to the German capital as the Repubic of Ireland's premier.
"I think we are seeing steady progress in the Brexit negotiations, but more needs to be done in the coming weeks and months to close the remaining gaps between the EU and the UK," Mr Varadkar said.
He added: "I thank the Chancellor and German government for their ongoing and resolute support.
"We will continue to support the EU chief negotiator Michel Barnier for his critical work.
"We should all remember, we are proceeding on the basis that nothing is agreed until everything is agreed and will be working closely with partners to make sure this is faithfully respected."
Mrs Merkel described relations between Ireland and Germany as "excellent".
She said Germany fully supported Ireland's position on the Irish border issue.
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