Unions vow strike as Greece finalises deficit plan

"We are making a huge effort to protect our economy from speculation and a lack of credibility, which have led to adverse borrowing terms," Papaconstantinou told the paper.

European ministers told their counterparts at a Group of Seven meeting on Saturday in northern Canada that they would make sure Greece sticks to its budget-cutting plan, but the pledges failed to reassure currency markets and the euro lost more ground on Monday.

(Writing by George Georgiopoulos and Daniel Flynn; Editing by Andy Bruce)