Bad loans worth 30 billion euros are being prepared for transfer to the asset protection scheme (APS) that the Finance Ministry is creating.
This is twice the original amount provided for, a development that highlights the government's resolve to tackle the problem of banks' nonperforming exposures.
Greece's consumer price index returned to negative territory in August as data for the month released on Tuesday by the Hellenic Statistical Authority (ELSTAT) showed a deflation rate of 0.2 percent compared to a year earlier.
The European Union-harmonized index showed a marginal increase of 0.1 percent, down from a 0.4 percent rate in July.
Greece has formally ended the last remaining banking restrictions imposed four years ago during a financial crisis that saw the country nearly crash out of the eurozone.
The decision announced last week took full effect Monday as limits were lifted on international business transactions, overseas cash withdrawals and money sent to students studying abroad, among other cash curbs.