Europe central bankers have been openly expressing views on the possibility of Greece leaving the eurozone as its leaders struggles to form a government.
Germany's top banker said it was up to the Greeks to decide, but if they did not keep to their bailout commitments, they would receive no new aid.
His counterpart in the Irish Republic said a Greek exit would be damaging but not necessarily fatal to the euro.
Greece is to make a final attempt at forming a government on Sunday.
President Karolos Papoulias is to meet party leaders after they failed to deliver a coalition through their own negotiations.
Greek voters punished mainstream parties which backed the bailout at last Sunday's parliamentary election.
If no new government is formed, a new election will have to be held, and opinion polls suggest Syriza - a leftist, anti-bailout party - will benefit most.
Syriza firmly rejects the terms of the most recent EU-IMF bailout, which requires tough austerity measures in return for loans worth 130bn euros ($170bn; �105bn).