"The central government's planned capital infusions come at a good time for public sector banks. But they don't go far enough," Standard & Poor's Credit Analyst Amit Pandey said.
In a report titled - India's Capital Infusions For Public Sector Banks Are Just A Breather, S&P said the stand-alone credit profiles and ratings on some PSU banks remain sensitive to any further deterioration in asset quality, capital, and earnings.
"The Basel III-related capital requirements could lead weaker PSU banks to lose market share to better-performing banks in the private sector, public sector... ," it said.
Besides, the PSU banks would raise an additional Rs 1.10 lakh crore from the markets in the next four years.
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It also said that PSU banks with lower capitalisation and internal generation of capital could become takeover targets, resulting in consolidation in the banking sector over the medium- to long-term.
"The Indian government's recent steps to support the capitalisation of public sector banks won't fully resolve their looming capital shortfall," S&P said.
S&P estimates that Basel III implementation will mean the banks will have fresh capitalisation needs of Rs 1.4 lakh for fiscal 2016-2019. They will likely require an additional Rs 80,000 crore to make provisions for non-performing loans and slippages from standard restructured loans.