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If Rodrygo gets more opportunities, I'm sure he could achieve much better performances, as he's quite good. Real Madrid's weak defense is due to several key injuries, preventing the coach from fielding a full squad for matches. The arrival of two new players this season will improve Real Madrid's defense, although they will still need time to adapt. Xabi Alonso's task won't be easy, but I'm confident he can overcome these issues over time, as achieving success in a short time is no easy feat.
The arrival of new players, especially defenders who will fill the back line, will certainly make the defense awake compared to the previous season and maybe if Rodrygo still gets the opportunity to play it is likely that he will show his performance better.
Regarding Xabi Alonso task as a coach to fix the bad gaps in the team, sooner or later it will definitely be fixed and Real Madrid performance will definitely improve, given Xabi Alonso previous experience is full of achievements, this is what makes the club target and offer this extraordinary coach.