Real Madrid defense needs adjustments and improvement, I'm sure this issue of poor defending is known to the coach Ancelloti because I see Real Madrid making signings and addding Rudiger also to the backline and as rumors has it they are still very active in the transfer market so they are working on strengthening their defense lines for the next season.
Rudiger was brought in from Chelsea to guard if one of their defenders could not play due to injury or card accumulation. der Militão is well known as an emotional defender and his hard game makes Rudiger an option at centre-back when one of them (Militao and David Alaba) is not playing. What Real Madrid did by buying Rudiger was one of the best efforts to welcome a very tight next season.
Rudiger's presence is expected to add strength to Madrid's defense. Carlo Ancelotti can now be a little more relieved because there are new options in defense. The joining of Rudiger is likely to change the composition a little in the defense sector, it is likely that Rudiger will be paired with Militao in the center back position while Alaba could be pulled into the wing-back position. Another option Ancelotti can also play a three-back scheme, but very rarely do we see Ancelotti implementing such a scheme. what is certain, Rudiger is the right solution for Madrid.