"We downgraded IOB following a recent deterioration in the bank's asset quality and our expectation that it will remain weak over the next 12 months," S&P said in a statement.
"We revised our assessment of the bank's risk position to weak from moderate, as our criteria define those terms. Accordingly, we lowered the bank's stand-alone credit profile (SACP) to 'bb' from bb+," it said.
The bank's exposure to high-risk sectors, such as iron and steel and textiles, is also greater than peers'.
The share of gross standard restructured loans outstanding in IOB's loan book is also high at 7.85 per cent.
The rating continues to reflect IOB's adequate business position, moderate capital and earnings, above average funding, and strong liquidity, it added.
The rating agency further said that very high likelihood that the government of India will provide timely and sufficient extraordinary support if the bank comes under financial distress.
IOB's aggressive growth over the past several years has stressed its internal control system, it said.
Moreover, the bank's focus on the corporate segment brings in some concentration in that segment.
The rating agency, however, said that it could upgrade the bank if its risk management improves, and its asset quality improves sharply and is more in line with that of the industry.
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