Forget about transferring good defenders to Real Madrid until Perez buys Mbappe, Holland or another star. Real Madrid needs to strengthen not only the defense, but already think about buying players in midfield. Cross and Modric are getting old and unable to play against fast and physically strong players. But Peres needs a star, or better two.
We are talking about priority, mate. Which line should be improved first? I think it is the defense line. For midfield line, they still have some options there, especially for attacking and central midfielders, some players can be positioned at the position. While for the attacking line, I think Real Madrid actually has some top strikers, they just need to improve their performance. Although Real Madrid cannot sign Mbappe, they can survive with that strikers. But for the defense line, it looks too bad. They have some center-backs who have the average quality, and sadly they cannot show good perfromance.