Bezos, who has a personal fortune of around $257 billion according to Forbes - making him the fourth-richest person in the world - will invest in Liverpool ahead of the new season.
FSG are reportedly preparing to make an announcement about a transaction as early as this week in what is a fast-moving deal between Bezos and Eduardo Saverin, one of the co-founders of the social network Facebook.
Sky Sports state that the investment in Liverpool, worth roughly one-third of the club, will value the organisation at $6 billion, making it one of the sport's richest-ever deals.
Saverin and Bezos join a consortium led by Amit Bhatia, who is the son-in-law of steel billionaire Lakshmi Mittal and was until recently a shareholder in Championship side Queens Park Rangers.
FSG, also owners of the Boston Red Sox, acquired Liverpool for just £300m with the club in a troubled state financially. Despite criticism, the owners have led the side back to the top as they found success under both Jurgen Klopp and Arne Slot.
An FSG spokesperson confirmed the talks earlier last month, saying: "An investment consortium led, managed, and represented by Amit Bhatia has expressed interest in making a strategic minority investment in Liverpool Football Club."
FSG previously sold 3% of the club to the US private equity firm Dynasty Equity in 2023. Now, with a 30%+ stake set to be sold, FSG, run by John Henry and Tom Werner, who are both in their mid-70s, are clearly keen to cash in.