I think there was a big gap in that area after Toni Kroos left football. Real Madrid has not filled this gap yet, but maybe they can get a player there in the mid-season transfer window. Of course, it depends on how they will proceed until the mid-season transfer window. If they draw a bad graph, I'm sure they can consider a transfer instead of Kroos.
Ancelotti trusted the young Eduardo Camavinga and Jude Bellingham which is the main reason why they feel they don’t need replacement for Kroos because even when he is still in the towards the last season, they used to play ahead of him due to his age, but he do start in some important matches and he do also come in when they need experience to win games.
Nevertheless, I am also not too confident with Madrid’s current squad especially the defensive part; I think Ancelotti need to send his scouts to check for defenders and midfielder to sign in the January transfer window because they can be disappointed if injuries keep coining because we have seen how many players are already injured in their squad.