Greece's Finance Minister Yannis Stournaras

Greece has three days to reassure its lenders it can deliver on conditions attached to its international bailout in order to receive the next tranche of aid, four euro zone officials said on Tuesday.

Athens and its creditors unlocking 8.1 billion euros ($10.6 billion) of rescue loans resumed talks on Monday on after a two-week break during which the government almost collapsed over redundancies at state broadcaster ERT.