FILE PHOTO: A Common myna sits next to the logo of India's e-commerce firm Flipkart installed on the company's office in Bengaluru, India April 12, 2018. REUTERS/Abhishek N. Chinnappa/File Photo

MUMBAI (Reuters) - Indian e-commerce firm Flipkart's board has approved a deal to sell an equity stake of about 75 percent in the company to a group led by Walmart Inc WMT.N for about $15 billion, Bloomberg reported on Friday, citing unnamed sources.

SoftBank 9984.T will sell its 20-plus percent stake as part of the deal, Bloomberg said, adding Google's parent Alphabet Inc GOOGL.O was likely to participate in the investment with Walmart.

A final close of the deal is expected within 10 days, although deal terms could still change and a deal isn’t certain, Bloomberg reported.

Flipkart and Alphabet did not immediately respond to requests for comment. Walmart and SoftBank declined to comment.

Earlier this week, Indian TV channel CNBC-TV18 reported that Amazon.com Inc AMZN.O has made a formal offer to buy 60 percent of Flipkart. Amazon, which is Flipkart's biggest rival in India, declined to comment on that report.