An anti-EU protester holds a banner in front of the parliament building during a demonstration of about five hundred people in Athens, Greece July 13, 2015. [Photo/Agencies]

He dismissed suggestions that Tsipras had been humiliated even though the summit statement insisted repeatedly that Greece must now subject much of its public policy to prior agreement by bailout monitors.

"In this compromise, there are no winners and no losers," Juncker said. "I don't think the Greek people have been humiliated, nor that the other Europeans have lost face. It is a typical European arrangement."

Tsipras himself, elected five months ago to end five years of suffocating austerity, said he had "fought a tough battle" and "averted the plan for financial strangulation".

But to get the accord through parliament by the deadline on Wednesday, Tsipras will have to rely on votes from pro-European opposition parties, raising big question marks over the future of his government and opening the prospect of snap elections.

Leftwing rebels in the ruling Syriza party and his junior coalition partner, the right-wing Independent Greeks party, indicated they would not tear up election pledges that brought them to power in January.

"We cannot agree to that," Independent Greeks leader Panos Kammenos told reporters after meeting Tsipras. "In a parliamentary democracy there are rules and we uphold them."