Fikayo Tomori completed a £25m ($34m) move to the Rossoneri from Chelsea after the Italian side decided to activate their option to buy the centre-back.
After an impressive half-season with Milan following his mid-season loan, he put pen to paper in a four-year deal with the Milan-based club. The England international made 22 appearances in all competitions, scoring just once in a crucial 3-0 win against Juventus in the league.
Tomori featured regularly as Milan finished third in Serie A, reached the Europa League round of 16 and the Coppa Italia quarterfinals. Chelsea have confirmed this news on their official website too.
This move would be considered an all-round win as Chelsea already have a number of options at central defence who are ahead in the pecking order, including Antonio Rudiger, Kurt Zouma and Andreas Christensen. In signing Tomori, Milan have made their second signing of this transfer window after Mike Maignan joined from Lille as a replacement for the departing Gianluigi Donnarumma.