Greece faces a week of urgent diplomacy to free up bailout aid and avert a potential default as world leaders press for a final resolution to the standoff.

With talks between the Greek Government and creditors due to resume in Brussels today, Prime Minister Alexis Tsipras faced a united front from Group of Seven leaders calling for movement to end the impasse.

United States President Barack Obama put concerns over the deadlock on to the agenda of a G7 summit hosted by Chancellor Angela Merkel in southern Germany yesterday.

Canadian Prime Minister Stephen Harper "emphasised the importance of addressing the Greek debt crisis".

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"There was unanimity of opinion in the room that it was important for Greece and their partners to chart a way forward that builds on crucial structural reforms", and returns to growth, said White House spokesman Josh Earnest.

The G-7 intervention raises pressure on both sides in the dispute to reach a compromise that unlocks the final 7.2 billion tranche of aid and brings Greece back from the edge of default, averting a possible exit from the 19-nation euro.

- Bloomberg