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The T-bills were priced to yield 1.75 percent, down five basis points from 1.80 percent in a previous sale in June - the lowest funding cost since January 2010 when the debt agency sold three-month treasury paper at 1.67 percent.
The sale's bid-cover ratio was 2.35, down from 2.99 in the previous sale.
The amount raised included 375 million euros in non-competitive bids. The settlement date for Tuesday's auction will be July 18. Athens has a stock of about 15 billion euros of T-bills, which it regularly refinances.