For the midfield, it actually won't be too much of a problem for Madrid because even if the worst possibility of Modric and Kroos leaving next season but Ancelotti has minimized it from the start by doing some rotation and habituation to his players when there is no Modric and Kroos from the last 2 seasons and their young players also in midfield are still very good now where there is Tchouameni, Camavinga and Valverde who can be maximized so even if they do not add a midfielder it is still not a big problem even though ideally there are several players who are brought later but indeed for now Madrid's focus is likely to still be on the attack and defense.
At the moment when talking about Mbappe it is still hanging because with what is happening now Mbappe in Madrid is also still uncertain even though there is a very big chance to join Madrid for Mbappe but we know that Mbappe and PSG always do drama every season especially when the transfer season takes place.
Real Madrid possesses one of the best midfield players in the world but how to rotate and use them haven't been a big issue for Real Madrid manager Carlo Ancelotti. The Italian manager is very experienced and surely knows how to maximize the use of his midfield options at the club. Luka Modric and Toni Kroos are the most experienced of the midfield players at Real Madrid and have contributed immensely to the club's progress over the last decade but reports have it that Luka Modric will be leaving Real Madrid at the end of the season and probably head to Saudi Arabia.
Young midfield players like Jude Bellingham, Federico Valverde, Camavinga and Aurelien Tchoumeni can play in the Real Madrid midfield ajd still deliver great performances. Toni Kroos is currently 34 years of age and I think he still have a lot in tank when it comes to playing and I won't be surprised if he continues to represent Real Madrid beyond the current season.
Modric's certainty is still unclear but it is likely that he will leave the Madrid squad even though his fate will be where we still cannot predict it because there is no situation that can really be ascertained that Modric's next destination after he leaves Madrid.
However, it will not be a big problem because Ancelotti's rotation in the last 2 seasons has functioned to keep the squad good despite Modric's departure.
In the end, it will have an impact because Modric is one of the cogs of Madrid's attack but on the other hand, they can be fine and I am sure of that because Madrid's young players are currently very good in terms of play and they can be relied on to support the midfield to be even better. Jude's position could be flexible but I think the trio of Camavinga, Tchouameni and Valverde is still a very good option.