The Greek parliament voted in favour of a law to grant citizenship to immigrants' children who were born and raised in Greece, an issue unresolved for generations.
Crisis-hit Greece is in the "final stretch" of negotiations with creditors and could reach agreement shortly, Finance Minister Yanis Varoufakis indicated.
French Prime Minister Manuel Valls said that there is "still a lot of work to do" if Greece and its creditors are to reach an agreement to avert a possible default.
European Commission chief Jean-Claude Juncker voiced frustration with Greek Prime Minister Alexis Tsipras in a media report amid the deepening debt crisis.
IMF chief Christine Lagarde warned that a resolution to five months of tortuous debt talks with Greece required "adults in the room" in an apparent sideswipe at Greek officials.
Greek Prime Minister Alexis Tsipras called European Commission chief Jean-Claude Juncker, their first contact on the stand-off over a bailout deal since last week.
European Central Bank chief Mario Draghi urged all sides in the negotiations on Greece "to go the extra mile", but insisted the ball was in Athens' court.
Greece's creditors piled pressure on cash-strapped Athens as the IMF pulled its team out of talks and the EU warned Athens to stop gambling with the possibility of default.
The EU's Economic Affairs Commissioner Pierre Moscovici said he believed "more than ever" that a debt deal was possible between Greece and its creditors.
Greek Prime Minister Alexis Tsipras was expected to meet with Angela Merkel in Brussels after the EU's top official for the euro said a breakthrough bailout deal could be "days" away.
Greek Finance Minister Yanis Varoufakis warned that EU leaders had a duty to avoid a historic "failure" and urged a swift accord in Greece's debt talks with its creditors.