The Greek parliament is to vote later on a second set of reforms needed to secure its bailout deal.
If MPs approve the financial and judicial reforms, Greece will be able to press ahead with negotiations for an €86 billion bailout from its creditors.
Prime Minister Alexis Tsipras has been trying to rally his Syriza colleagues, saying the Greek people had "pinned their hopes" on staying in the euro.
The vote is expected to pass with the support of opposition parties.
Mr Tsipras needs to avoid a significant rebellion from within the ranks of Syriza.
Some 32 of the radical-left party's 149 MPs - including former finance minister Yanis Varoufakis - voted against the first tranche of bailout measures last week. Another six abstained.