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Prime Minister David Cameron has urged successful parties in last weekend's Greek elections to move swiftly to form a government, warning that delay could be "very dangerous".
His comments came as he arrived in Mexico for a G20 summit of the world's leading economies, which will be dominated by the crisis in the eurozone and the fallout from the Greek polls.
Mr Cameron has already held a conference call with the leaders of Germany, France, Italy and Spain as well as the presidents of the European Commission and European Council.
It is understood that the leaders were encouraged by the results of the ballot, which saw the centre-right New Democracy party out-poll the far-left Syriza in an outcome which makes Greek departure from the eurozone less likely.
There is now a sense of urgency about New Democracy - which is signed up to the austerity programme demanded in a memorandum setting out the terms of Greece's multibillion-euro bailout - forming a coalition government in Athens.
Mr Cameron said: "The outcome of the Greek election looks clear in terms of a commitment to stay in the eurozone and to accept the terms of the memorandum.
"But I think those parties that want that to happen can't afford to delay and position themselves. A delay could be very dangerous."
With 129 of the Greek parliament's 300 seats, New Democracy lacks enough MPs to govern alone, and must seek allies among the pro-bailout Socialists, who came third.
Party leader Antonis Samaras, who now has three days in which to build a coalition, said he wanted to form a government with long-term prospects.
"My position is that there must be a national salvation government with as many parties in it as possible," he said after talks with Alexis Tsipras, leader of the radical left Syriza party.
But Mr Tsipras, whose party came second on Sunday, quickly rejected the proposal to join a coalition.
Under the 37-year-old former student activist, Syriza campaigned on a pledge to scrap Greece's bailout commitments.
However, the coalition deal that evaded Mr Samaras after an inconclusive election on May 6 looked more attainable.
With the Socialists' backing, he would control 162 seats, and could seek a further boost from the small Democratic Left party.
