Southampton have signed midfielder Romeo Lavia from Manchester City for a fee which could rise to £14m.
The deal is believed to be worth an initial £10.5m with a further £3.5m in add-ons and a 20% sell-on clause.
City also have a buy-back option for the Belgium Under-18 international, who joined from Anderlecht in 2020 and made his senior debut for the Blues in the Carabao Cup last season.
"My Manchester City journey has come to an end," Lavia posted on social media.
"I've developed into an even better player, person and it was also an honour to make my debut for this massive club.