Greece has overcome difficulties and is on course for growth, International Monetary Fund (IMF) managing director Christine Lagarde told Australian state TV channel ABC.

Greek bond yields hovered on Tuesday around their lowest since the country's debt was restructured, with its international lenders set to return to Athens this week to resume bailout talks.

The viability of the Greek debt and the financing gap for the years 2015-2016 will be discussed “from the summer onwards,” European Commission Vice-President Ollie Rehn said in an interview.