London - The Greek government will on Sunday night consider imposing capital controls and closing the country's banks on Monday, Greek Finance Minister Yanis Varoufakis has told BBC Radio.
Greek Prime Minister Alexis Tsipras called a referendum on austerity demands from foreign creditors on Saturday, rejecting an "ultimatum" from lenders and putting a deal that could determine Greece's future in Europe to a popular vote.
In an interview due to be broadcast in Britain at 1200 GMT, Varoufakis said his government would weigh both decisions overnight, Nick Sutton, editor of BBC Radio 4's The World This Weekend programme, said on Twitter.
Varoufakis also said international creditors did not meet his country's requests "even quarter way".
ECB considers tightening emergency funding for Greek banks - sources
European Central Bank policy setters are considering tightening Greek banks' use of an emergency funding lifeline but keeping the back-up facility open, people familiar with the matter said.
Such a move would curb those lenders' access to a multi-billion-euro central bank support that they use to pay out deposits, making it harder for them to meet such demands.
"There is a possibility of an extension," said one of the people with direct knowledge of the telephone discussion among the ECB's decision-making Governing Council, adding that a bigger 'haircut' is being discussed.
Such a step involves imposing a higher valuation discount on the security banks offer for this funding to reflect the impact of a likely default by Greece on Tuesday on the International Monetary Fund.
If the haircut is steeper, it curbs banks' use of this Emergency Liquidity Assistance (ELA). But the calculation is not usually publicised, meaning it would not be clear how much such funding had been closed off.
The limit for funding is now roughly €89bn, sources have told Reuters, and has been held steady at this level for a number of days amid growing protest from Germany.
Even before Tsipras called a referendum for next Sunday on creditors' bailout demands, the head of Germany's Bundesbank had criticised the use of such emergency credit.
If Greece were to leave the euro zone, this funding, which is a form of overdraft with the euro zone's central bank system, would fall to the bloc's other members to pay.
Speaking on German television on Saturday, German Finance Minister Wolfgang Schaeuble put a question mark over the solvency of Greek banks, a key condition to qualify to receive such finance.
"The ECB has always said that as long as Greek banks are solvent, then emergency loans, the ELA, can be granted," he said.
"And now there is naturally a new situation that, because of the developments, the liquidity and solvency of Greek banks, or some Greek banks, could be in doubt."