Standard & Poor's reiterated its negative rating outlook on India's credit rating, which is one notch above junk status, warning of risks if the government carries out less reform than the agency says is needed to boost growth.

The rating agency, which warned of at least a one-in-three chance of a downgrade within the next 12 months, said the major risks for a lower rating are a high fiscal deficit and heavy government borrowing.

India's benchmark 10-year yield rose 4 basis points to 7.41 percent from levels before the statement. The yield closed at 7.39 percent on Thursday.

"If India's general government fiscal or current account deficits worsen contrary to our expectations, we may lower the ratings," S&P said in a release on Friday, after affirming India's BBB- rating with a negative outlook.

Finance Minister P Chidambaram has said he will stick to a budgeted fiscal deficit target of 4.8 percent of GDP in the fiscal year ending March 2014 after being able to restrict the deficit to around 5 percent in the previous fiscal year.

"We may revise the outlook to stable if the government carries through with its plans to unleash public and private investments (for example, by enacting the land acquisition bill), to implement a nationwide government sales tax, or to further trim fuel and fertilizer subsidies," S&P said.

India's growth slipped to a decade low of 5 percent in the fiscal year that ended in March 2013 after posting nearly double digit growth in 2008. Recent corruption scandals have prevented the government from passing key reform bills in the parliament.