I believe if Xabi Alonso notices his players are playing individual football instead of team football next season, he will call them into order, and if any player feels that he's too big to follow Xabi Alonso's tactics, Xabi Alonso will have no option but to drop that particular player from his squad and use the player who will listen to him and fit in with his tactics.
It's perfectly natural for Xabi Alonso to drop such players from Real Madrid's first-team squad because he's trying to develop the Real Madrid team, not just individuals, for a team as big as Real Madrid. No matter how great a player is, if they don't have the support of their teammates, they won't be able to achieve good results in any match. Therefore, the players must not be selfish in their work to bring good results to Real Madrid next season, because their goal is to win the title and also to be strong throughout the season in major competitions like the Champions League.