The 21-year-old signed for Real from Manchester City on a six-and-a-half-year contract in January 2019. He joined City from Malaga aged 14 in 2013 and made 15 first-team appearances. AC Milan, who finished sixth in Serie A in 2019-20, announced Diaz will wear the number 21 shirt. He made six La Liga appearances in 2019-20, all from the bench, as Zinedine Zidane’s side won the title.