Five hardliners in Greece's ruling Syriza party said today dropping out of the euro zone and a return to the drachma was preferable to a deal with international creditors laced with austerity and without any provision for debt relief.

"The government even at this hour can and should respond to the institutions' blackmail with the dilemma: either a programme without new austerity, with funding and a debt write-off or an exit fron the euro and suspension of payments of the unjust and non viable debt," the statement signed by five members of the party said. Three of them are lawmakers and two members of Syriza's political committee.

The Greek government is seeking support from the country's fractious parliament to a plan for tax and fiscal reforms, seeking a €53.5 billion lifeline from lenders to keep the country afloat.

Meanwhile, Greek centrist party To Potami will back a government blueprint of fiscal reforms submitted in parliament to secure desperately needed aid from international lenders to stave off bankruptcy, a spokesman said.

"Certainly we will authorise the prime minister to bring a deal," spokesman Dimitris Tsiodras told Reuters after the party's parliamentary group met.

To Potami has 17 seats in Greece's 300-member parliament.