"We could raise the rating if the economy reverts to a real per capita GDP trend growth of 5.5 per cent per year and fiscal, external, or inflation metrics improve," the global rating agency said.
The revision in outlook comes ahead of Prime Minister Narendra Modi high profile visit to the US, which among things is aimed at procuring investments. Modi is scheduled to meet top US corporates.
S&P has affirmed the 'BBB-/A-3' sovereign credit rating on India and revised the outlook on the long-term rating to stable from negative. Stable outlook reduces risk of any possible sovereign rating downgrade.
"The stable outlook for the next 24 months reflects our view that the new government has both the willingness and capacity to implement reforms necessary to restore some of India's lost growth potential, consolidate its fiscal accounts, and permit the RBI to carry out effective monetary policy," it added.
After taking over as Prime Minister in May, Modi has launched host of initiatives, including 'Make in India' campaign to ease business environment and fetch FDI.