REUTERS

"The Greek government will make use of all our legal rights," said the finance minister, Yanis Varoufakis.

"We are taking advice and will certainly consider an injunction at the European Court of Justice. The EU treaties make no provision for euro exit and we refuse to accept it. Our membership is not negotiable," he told the Telegraph.

Greek officials said they are seriously considering suing the European Central Bank itself for freezing emergency liquidity for the Greek banks at EUR 89 billion. It turned down a request from Athens for a EUR 6 billion increase to keep pace with deposit flight.

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This effectively pulls the plug on the Greek banking system. Syriza claims that this is a prima facie breach of the ECB’s legal duty to maintain financial stability.

Varoufakis said Greece has enough liquidity to keep going until the referendum but acknowledged that capital controls introduced over the weekend were making life difficult for Greek companies.