Having impressed during his half-season loan at San Siro, the defender has now been tied down to a deal that runs until 2025
Fikayo Tomori has completed a £25 million ($34m) move to AC Milan from Chelsea, with the Italian side having exercised their option to buy the defender on a permanent basis.
Having impressed during his time on loan at San Siro, the Canada-born England international has put pen to paper on a four-year deal with the Rossoneri.
Tomori becomes Milan's second signing of the summer, with Mike Maignan having joined from Lille to replace Gianluigi Donnarumma.
