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.
Greek Prime Minister Alexis Tsipras has asked for "light at the end of the tunnel" after years of austerity in any deal to tackle the country's debt crisis.
Mr Tsipras told the European Parliament that plans presented to the Eurogroup would look to restructure Greece's debts, but alongside reforms taking on wealthy vested interests in the country, who had failed to bear their share of the burden.
The Greek PM also outlined an "agenda for growth" to revitalise its ailing economy.
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!'