I don't think Real Madrid's defense is weak last season. Their defense is stable enough. At the same time they have a great goalkeeper. Courtois is very talented. Real Madrid should strengthen their attack.
If someone says Real Madrid defense is weak, then what is the most losing goals ever conceded to Real Madrid, Real Madrid have Courtois the greatest goalkeeper and even though they escape the Real Madrid defense but will not have a chance to score a goal from goalkeeper Courtois.
Courtois performance in the champions league final was extraordinary, but a brilliant performance from courtois could not eliminate the fact that in fact madrid defense was very weak this season, if you see match and the number of goals that Madrid have conceded this season throughout the UCL match, surely you will realize that madrid lucky to have a sharp front line because it can cover the weakness in the defense sector, in my opinion, madrid poor defense so far has forced Courtois to work hard to make many saves like in champions league final yesterday , and of course madrid can't hope if they continue to rely on courtois good performance without wanting to improve his defense next season, but compared to the rest of us, of course ancelotti knows madrid's weaknesses and in fact he prioritizes rudiger and a few defenders to buy in the transfer market this summer.