The RBI said it had not found initial evidence of money laundering against the three banks.
The market shares has already tumbled to 48 per cent from the earlier 56 per cent.
The majority view remains for the central bank to leave the cash reserve ratio unchanged at 4 per cent.
There will be more incentive for the parent company to share technology with the Indian unit.
The bank posted a net profit of about Rs 2,300 crore.
HDFC Bank met forecasts with a 30 per cent rise in quarterly profit led by higher loan growth, fee income and stable asset quality.
The consortium might get about Rs 1,000.
India will soon allow corporate houses to open banks despite misgivings within the RBI.
The key lending rate is now 9.7 per cent.
CEO Rana Kapoor said no such discussion or proposition has ever transpired.
An estimated 177 million Muslims in India, the largest Muslim minority population in the world, are unable to use Islamic banks because laws covering the sector require banking to be based on interest, which is forbidden in Islam.