Greece to vote on second bailout bill

Greek MPs are set to vote on a second batch of reforms that must pass if Athens is to receive its third huge international bailout.

The ballot is being seen as a key test of Prime Minister Alexis Tsipras' authority.

The embattled premier suffered a major parliamentary rebellion on the cash-for-reforms deal last week, with a fifth of MPs from his radical-left Syriza party voting against sweeping changes to Greece's taxes, pensions and labour rules.

Tsipras was forced to rely on the support of opposition MPs to get the law passed.

The second bill is less controversial, with MPs set to vote on Wednesday on measures including an EU directive that guarantees bank deposits up to 100,000 euros ($A145,600), as well as civil justice reforms designed to speed up legal proceedings and reduce their costs.

The government is hoping for fewer dissidents but analysts say it will nonetheless prove a test of whether Tsipras can avoid a split within Syriza that could fell his fragile coalition after just six months in power, forcing early elections.

The prime minister received a boost on Tuesday when Standard & Poor's raised its credit rating on Greece by two notches to CCC+ from CCC-, still in junk territory but a step in the right direction.

S&P said the scenario of Athens defaulting was no longer inevitable in the coming year and thus the chances of Greece having to pull out of the euro were reduced, though still "high".

Athens agreed to a package of tough economic reforms last week in exchange for a third bailout of up to 86 billion euros.

Tsipras said he had read all the "heroic declarations" from his critics about the path he should have taken but insisted there was "no alternative solution".

"I am aware of the responsibility I have taken in making a difficult compromise," he told colleagues on Tuesday.

He reshuffled his cabinet just before the weekend after sacking MPs who voted against the first wave of reforms.