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Joao Felix has got what he wanted by playing with Barcelona to win the La Liga trophy and coupled with a fairly large fee of course Joao Felix is now like a lucky player he can also have the advantage of increasing his popularity as a talented young player when managed to win the title this season.Xavi has realized Joao Felix dream of wanting to join him but when he succeeds in becoming a great and competitive player for Barcelona maybe Atletico Madrid will also feel disappointed because they let him go to Barcelona.
Xavi and Barcelona fans hope that he can contribute as much and as well as possible for the team so that it is proportional to the amount of money he receives.
Xavi Hernandez has shown he's a manager especially in man-management and I think his he'll help the Portuguese to have a good spell at the club this season. If effectively used, Felix attacking skills and pace will b serve as a big threat to any club that'll face Barcelona this season.
Even though in his first game with Barcelona he didn't give any goals or assists in the next matches I hope he can show his contribution and make Xavi and the fans proud of his presence in the Barcelona squad.
Things are going on well for Real Madrid. They are deprived of 3 important members like Courtois, Militao and Vinicius Junior. But this is still not an obstacle for them to maintain a winning streak. Bellingham is playing a huge role in this form of course. He is even the current leader in top scorers table. 
Madrid have found their replacements. Kepa for curtois, Rudiger for militao and joselu can still play to replace vini even though joselu was not as good as vini. In fact, madrid is also having bellingham at this moment to replace benzema. It's not a problem for the club to lose those important players due to the injury. That's why madrid needs to learn from this case if the club must have also good backup once the main players were injured.
Real Madrid will never lose strength even if their mainstay players have left or are injured and that is true with players like Joselu or Bellingham and some of the players you have mentioned.
However I'm wondering how good they will deal with big opponents without these players. I mean especially the matches against Barcelona and Atletico Madrid. They are going to take on Atletico Madrid very soon for example. The reason why I wonder this is that it wasn't really easy for them to defeat Getafe home.
I think that even if madrid was losing against the big club and it's not a problem. Despite facing tough competition from top clubs like Barcelona and Atletico, Madrid still has a chance to emerge victorious. The injuries of some players did not result in Madrid completely losing its power. Madrid can also get draw against a strong opponent. Madrid just need to puts more attention to the barcelona.