LeBron James is joining Fenway Sports Group as a partner, giving him an ownership stake in its subsidiaries that include the Boston Red Sox, Liverpool Football Club, Roush Fenway Racing and the regional sports network NESN, according to sources.

James already owned 2% of Liverpool, the current English Premier League champion.

In addition to James coming onboard, FSG received a $750 million investment from RedBird Capital Partners, according to The Boston Globe, which first reported James' ownership stake.