Berlin: British Prime Minister David Cameron has warned he would no longer be able to guarantee that Britain would remain a member of the European Union if European leaders elect Jean-Claude Juncker as European Commission chief, Germany's Spiegel said.

Mr Cameron had explained, on the sidelines of an EU summit in Brussels, that if Mr Juncker became Commission president, he would no longer be able to ensure Britain's continued EU membership. A majority vote for Mr Juncker could destabilise his government to the extent that an "in-out" referendum would have to be brought forward.

That in turn, they understood, would most likely lead to the British people voting to quit the EU, the magazine said.

Reuters