A group of about 20 people who contracted the hepatitis C virus via tainted blood products is considering filing a lawsuit against the state and now-defunct drugmaker Green Cross Corp., sources close to the group said Sunday.

An estimated 2 million people have been infected with HCV across Japan, medical experts say, adding they were mainly infected through tainted blood products.

A team of about 100 lawyers will oversee negotiating relief and compensation issues, including free treatment for infection, following the release of an internal investigation report by the Health, Labor and Welfare Ministry, the sources said.