By Jonathan Davies

The chief economic spokesperson for the Syriza party, which won the Greek general election on Sunday, has told the BBC that it is unrealistic to expect the country to repay its debt in full.

"Nobody believes that the Greek debt is sustainable," Euclid Tsakalotos said.

Syriza campaigned and won the election on one key front - to end austerity and not to pay all of its debt. Greece received a €240bn bailout package at the height of the financial crisis, which brought along with it a set of strict economic instructions from the Troinka of European Central Bank, European Commission and International Monetary Fund.

Greece's debt is roughly 175% of its annual GDP.

"I haven't met an economist in their heart of hearts that will tell you that Greece will pay back all of that debt. It can't be done," Mr Tsakalotos said.

"It's going to be a very funny and a very dangerous Europe with very strong centrifugal political forces if they signal that after a democratic vote they're not interested in talking to a new government.

"It will be a final signal that this is a Europe that can't incorporate democratic change and it can't incorporate social change."

Syriza's pledge not to pay the country's full debt has led to speculation that Greece could be forced to leave the eurozone. But yesterday (Monday) the party's leader and new Prime Minister Alexis Tsipras said he wanted to renegotiate the debt, rather than leave the eurozone.

Mr Tsakalotos added: "my worst nightmare if the eurozone collapses because Greece falls".

"And if Greece falls and is removed from the eurozone - the eurozone will collapse. We said from the beginning the eurozone is in danger, the euro is in danger, but it isn't in danger from Syriza... it is in danger from the very policies of austerity".

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