Greece's troubled coalition government said it would call a vote of confidence in parliament next week, hours after the country's leftwing opposition demanded early elections citing ongoing austerity measures.

In an announcement Wednesday, read out on state television, the government said it would call for the vote, but gave no further details.

Prime Minister Antonis Samaras' conservative-led coalition could be forced to call an early election before March as it requires opposition support in parliament to elect a new president.

The conservatives are currently trailing the opposition anti-bailout Syriza party in opinion polls.