"We view the capital outflows and depreciating rupee as an indication of weakening investor confidence in India ... We maintain a negative outlook on India's BBB- sovereign credit ratings," S&P Senior Director Sovereign and International Public Finance Ratings (Asia-Pacific) Kim Eng Tan said in an emailed statement.
'BBB-' is the lowest investment grade and a downgrade would mean pushing the country's sovereign rating to junk status, making overseas borrowings by corporates costlier.
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Referring to the recent measures announced by the government to restrict capital outflow, Tan said these "have also increased uncertainties among investors both foreign and domestic".
"If the uncertainty continues, business financing conditions could deteriorate further and investment growth could slow further".
In order to tame the sliding Rupee, the Reserve Bank and the government had on August 14 announced stern measures, including curbs on Indian firms investing abroad and on outward remittances by resident Indians.
S&P's comments come on a day when the rupee touched the record low of 64.11 to a dollar in intra-day trade today.
Moody's Investor's Service in its report today said the depreciating rupee is likely to inflate the fuel subsidy bill, weaken the credit quality of oil companies and put pressure on the fiscal deficit.
Earlier in May S&P had warned that it may downgrade India's sovereign rating to junk grade if the government fails to pursue reforms and check deterioration in fiscal and current account deficits.