Walmart Inc. has decided to sell its Japanese supermarket unit Seiyu GK for ¥300 billion to ¥500 billion ($2.7 billion to $4.4 billion) amid fierce competition from online retailers, sources close to the matter said Thursday.

The U.S. retailer is in talks about a deal with Japanese retailers and some investment funds, according to the sources.

Walmart said it does not comment on market speculation.