Greece is prepared to discuss possible concessions on budgetary targets, a key red line in its bailout talks with its creditors, a Greek government source told AFP on Wednesday.

"It is very difficult for the Greek side to make more concessions, but we are prepared to discuss a solution," the Greek government source said.

"There is no deal for a one percent surplus, but the question is on the table," the source said, referring to a budget target for 2015 that Athens has so far dismissed on the basis that it would require more austerity to achieve.