Germany's EU Commissioner Guenther Oettinger said on Friday he thinks Greece and its creditors should be able to reach a deal but may need another meeting ofeuro zone leaders next week.
"We are working so that Greece stays in the euro zone," Oettinger told German radio Deutschlandfunk.
"On this basis I think an agreement will still be possible in the next eight days - if necessary via a further meeting of government leaders," he said.
The Eurogroup will meet in Brussels on Friday to discuss further help for Greece.
Germany has rejected a Greek proposal for a six-month extension to its euro zone loan agreement, saying it was "not a substantial solution" because it did not commit Athens to stick to the conditions of its international bailout.
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