Greece’s battered banks need €14.4bn (£10.2 billion) in fresh money to get back on their feet and resume normal business, the European Central Bank said.
The figure is the result of an ECB review of Greece’s four main banks, which must now submit plans to raise the money to boost their capital buffers against losses.
That could come from investors, sacrifices by lenders or from the €86bn (£61 billion) bailout from other eurozone governments.
The hole the ECB found is smaller than originally feared. The bailout provided for up to €25bn (£17.8 billion) to fix the banks.
Greece is racing to bail out the banks before the end of the year, when new European rules take effect.