The defender has moved to Nice on-loan to the end of the season.
Edu said: “William Saliba is a player with a huge amount of talent and potential. We're confident he will have a great career with us but we must remember that he is still only 19 years old and has a lot of time ahead of him.
"William experienced a very challenging time last year, with his playing time limited by injury and the early ending of the Ligue 1 season due to the pandemic.
"So together with William, we have decided that spending the rest of the season on loan with Nice is the best way for him to develop. We will be keeping in close contact with William during his time with Nice and look forward to seeing him make good progress until the end of the season."