According to the "Football Market" news, Zidane asked Real Madrid not to sell Dias, he will focus on the performance of Dias this season.
Diaz scored twice in the previous U21 national team game, and he is currently loaned to AC Milan by Real Madrid. There is no buyout clause in the contract.
It is reported that Zidane himself asked Real Madrid not to lose control of Dias, so Real Madrid only accepted the loan request from AC Milan. This season Zidane will focus on the performance of Dias in AC Milan.