The Greek cabinet on Friday approved new austerity measures in a bid to seal a 130-billion-euro bailout from the EU and the IMF.
Six members of the ruling coalition quit over the plans.
Parliamentarians will start voting on the package tomorrow.
Even if that package is approved, the EU wants an additional 325 million euros in spending cuts.
Greece needs more emergency funding or it faces a messy default by March 20th when a 14.5 billion euro debt repayment is due.
The reductions in public spending being asked of Athens has sparked anger on the streets of the Greek capital.
Protesters clashed with police outside parliament on Friday.
There were also reports that some of the demonstrators hurled petrol bombs.
A 48-hour general strike is set to continue on Saturday.