Kroos' absence could impact Real's midfield if Ancelotti fails to find a good replacement for him. It will be very difficult to do this fully, because he was a player of a very high level, but in time Ancelotti will cope with this task, perhaps Rabiot will take his place if he decides to leave Juventus, at the moment he has not decided anything with the extension of the contract, he left the solution to this issue after the Euro, I think everything should be resolved in the near future.
Real Madrid have enough players to replace Kroos now and they already prepared for this few years ago. They know someday Kroos will leave Real Madrid, so Real Madrid no longer too rely on him anymore. If you are following Real Madrid, you must realize that Kroos more often sit on the bench last season, Modric also experienced the same thing. Bellingham-Valverde-Camavinga/Tchouaméni are the main midfielders of Real Madrid now, they don't need Rabiot. These players are even better than Rabiot, so why Real Madrid must sign a new player to replace the role's of Kroos? I assume Anceloti prefers to focus on signing new defenders if he wants new players to strengthen Real Madrid squad. The latest rumor I heard that Real Madrid is trying to sign Alphonso Davies and Trent Alexander-Arnold.
Gradually, Madrid's senior players will be replaced by young troops. for example, last season, Modric was more likely to be benched. Several young midfielders are preferred to be the main starters in Carlo Ancelotti's squad.
Yep. Ancelotti's project is to regenerate Real Madrid squad. He already has enough players to replace the senior players in the midfield line. Last season, Modric and Kroos were very often on the bench, it is the way to make younger midfielders to have more time to play. Now, Real Madrid has no problem if Modric and Kroos left the club, Ancelotti already has new main players on the midfield line.