Washington - Standard & Poor's cut Greece's debt rating outlook to negative on Tuesday, saying the worsening economy and political challenges could soon force another downgrade.

With Greece's sovereign credit rating already at junk-level CCC, S&P said Athens' lenders are likely to have to adjust their bailout financing terms or put up more money to avoid another downgrade for the country.

“The negative outlook reflects the potential for a downgrade if shortfalls in Greece's 2012 deficit and arrears targets established under the current EU/International Monetary Fund programme are not met by new funding or other relief” from key creditors, S&P said.

S&P said Greece is likely to require additional financing this year from the European Union and IMF to be able to stay afloat, given the delays in closing its budget gap and its contracting economy.

It said Athens will probably be unable to meet the conditions of the current EU/IMF bailout programme that would allow it to secure the next tranche of rescue financing, crucial to remaining stable.

“We are revising the outlook on the long-term ratings on Greece to negative, reflecting the possibility of a downgrade if Greece fails to secure the next disbursement of the EU/IMF Programme,” it said.

S&P projects the Greek economy will contract by 10-11 percent over 2012-2013, more than double the assumption that underlies the EU/IMF bailout programme.

“In our opinion, the deepening contraction in Greek GDP beyond the EU/IMF programme's assumptions and the related worsening of the fiscal position imply a high likelihood that Greece will require additional financing of as much as seven billion euros this year,” it said.

That estimate could be reduced, however, if programme lenders lower their performance targets for deficit reduction or other fiscal burdens, S&P said. - Sapa-AFP