Some of Greece's biggest banks may have to shut and merge with their rivals, it has been claimed.
A European official told the Reuters news agency that Greece's four big banks - National Bank of Greece, Eurobank, Piraeus and Alpha Bank - could be reduced to just two.
European leaders are meeting on Sunday in a bid to strike a financial aid deal with Greece.
Foreign visitors using credit and debit cards issued outside of Greece will not be restricted to the daily limit imposed on ATMs in the country.
The Greek government has imposed a €60 (£38) daily limit on all ATM transactions in response to the banking crisis currently engulfing the nation, and worried tourists had been seen queuing up alongside locals to withdraw cash.
Greek citizens will also be allowed to pay bills online, but money cannot be moved into offshore accounts, according to capital controls imposed in the wake of collapsed talks with the country's creditors.
The Greeks have voted to reject the austerity terms demanded by eurozone creditors - so, what happens next?
Greeks have voted to reject the terms of an international bailout, putting it on the brink of a eurozone exit.
Greece's controversial Finance Minister Yanis Varoufakis has released a defiant statement of resignation entitled 'Minister no more!'