Yes Bank's common equity tier 1 capital at the end of June stood at 8 per cent.

Yes Bank is close to securing a deal to sell a minority stake to a global technology company to help boost the private lender's capital, the bank's CEO said.

"We are in fairly advanced level of talks right now and it is close to being a done deal," Ravneet Gill, chief executive and managing director of the corporate and retail bank, told Reuters in an interview.

Mr Gill said the stake sale was likely to be less than 10 per cent initially but could rise, describing the buyer as one of the world's top three technology companies that had not previously invested in a bank. He did not name the investor.

The board has given country's fourth largest private lender the go ahead to raise more growth capital. The bank has approval to raise $1.3 billion but aims to bring in an additional $1 billion to $1.2 billion via a preferential allotment.

Under central bank rules, an individual shareholder cannot hold more than 15 per cent in a bank.

Mr Gill said that "15 per cent at the current market cap is not much but hopefully we will tranche the deal and as the price goes up that amount that we get for the deal will also go up."

Shares in Yes Bank closed on Monday at Rs 63, 77 per cent below trading levels at the start of the financial year on April 1. The bank has said the tech investment would help restore investor confidence in the stock.

Markets are closed on Tuesday for a public holiday.

In addition to the tech investor, smaller investors could pump in about $200 million to $250 million, Mr Gill said.

"There are two very large Indian family offices, there is a European and also an American private equity firm that have expressed interest," he added.

In August, the bank raised nearly $275 million via qualified institutional placement (QIP), a capital-raising tool commonly used in India, to improve its capital adequacy ratio.

Yes Bank's common equity tier 1 capital at the end of June stood at 8 per cent, marginally above the regulatory requirement of 7.375 per cent. After the QIP, the ratio improved to 8.6 per cent.

Gross non-performing loans as a percentage of total loans spiked to 5.01 per cent at the end of June, weighing on the lender.