Greece's Prime Minister Alexis Tsipras is set to call a snap electionfor 20 September, according to Greek media.
Mr Tsipras has faced a rebellion within his ruling hard-left Syriza party over a new bailout deal which has been agreed with international creditors.
Greece received the first €13bn ($14.5bn) tranche on Thursday, allowing it to repay a debt to the European Central Bank and avoid a messy default.
But the austerity measures needed for the deal angered many in his party.
Mr Tsipras had to agree to further painful state sector cuts, including far-reaching pension reforms, in exchange for the bailout - and keeping Greece in the eurozone.
The overall bailout package is worth about €86bn over three years. The payment of the first tranche was made on Thursday after the bailout deal - Greece's third in five years - was approved by relevant European parliaments.