Greece raised 1.3 billion euros (1.68 billion U.S. dollars) in a fresh treasury bills auction held on Tuesday, according to the country's Public Debt Management Agency (PDMA).

In particular, Athens sold 1.3 billion euros in a three-month treasury bills sale at an interest rate of 4.05 percent, keeping the rate unstable compared to a similar auction held in February.

According to PDMA officials, the sum raised on Tuesday will be used to cover an older issue which comes due on Friday.

Since 2010 monthly treasury bills sales are Greece's sole remaining source of funding along with the international bailout aid from the European Union and the International Monetary Fund, as the debt-laden country has been shut of international markets.