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Nine of the 28 member state in the EU are currently not part of the single currency. The UK and Denmark are exempt, but the remaining seven nations all agreed to adopt the euro when they joined the bloc. And now the European Commission has now demanded they them all start using the crisis-hit currency within eight years, according to insiders.

The move, revealed by German publication Frankfurter Allegemeine Zeitung, who obtained a leaked copy of a Comission report. It is likely to be fiercely opposed by Hungary, Poland and the Czech Republic's eurosceptic governments. Just last week, Polish finance minister Mateusz Morawiecki said it was "not in Poland’s interest" to join the eurozone. Warsaw is worried about losing its financial autonomy.

GETTY The EU wants every member state to adopt the Euro by 2025, reports claim

Why these nations could leave the Eurozone Fri, February 24, 2017 Heavily indebted Greece has no acute shortage of money, but will need money again from the ongoing aid programme this summer. But Athens is not the only shaky candidate of the Eurozone. These are the other countries causing worries Play slideshow 1 of 7

GETTY The move will anger countries opposed to further European integration

The eurozone push could also cause controversy in Sweden, which held a non-binding referendum on whether to adopt the euro in 2003. More than 55 per cent of voters said the in the Scandinavian country want leaders to reject any move to join the eurozone. Croatia, Romania and Bulgaria, the EU's newest member states, have yet to meet the economic criteria to start using the currency. Eurocrats meet at least once every two years to assess if candidate countries are strong enough to join the euro. They base their decision on a range of economic criteria such as inflation, government debt and interest rates.

AFP•GETTY European business leader expect the eurozone to shrink or collapse