Not just Xabi Alonso but there has been many fans too who have said same about having to play Vinicius and Mbappe together because it makes Mbappe not to play his natural position since Vinicius would be playing from the wing side. But it's now left for Alonso to find remedy to this since he has voiced it out as one of Madrid's problem.but an not sure that selling Vinicius will be a choice in his best interest if he really wants to have a quality team that can match against their opponents for next season.
That is the biggest issue when teams or clubs decide to buy players because of their name and not because of their quality and type of game and how it fits into the team. That was one of the problems PSG was fighting with for a very long time when the most important attribute was a high price and a big name. But then they had these three players namely Mbappe, Neymar and Messi and while it was fun to watch them play sometimes, you could see that they were not the perfect combination of players to play against more carefully chosen squads.