The European Union says that talks with creditors to keep Greece from going bankrupt "are being made more productive and efficient" as the country faces a growing cash crunch.

EU Commission spokeswoman Annika Breidthardt said Tuesday that the pace of talks "have intensified" since a weekend meeting of eurozone finance minister, where Greek minister Yanis Varoufakis came under intense pressure from his colleagues.

She refused to elaborate on reports of the sidelining of Varoufakis as the prime contact in the bailout talks beyond saying ministers were happy to talk to any Greek representative, "as long as they have a mandate to negotiate."

Euclid Tsakalotos, minister of international financial relations and a close ally to Prime Minister Alexis Tsipras, will handle the coordination within Varoufakis' negotiating team.