Why was Mbappe left out of the El Clasico squad?

Real Madrid has announced the squad for the La Liga Matchday 35 El Clasico against Barcelona. The most notable detail is that the 'Royal Club' forward Kylian Mbappe has not been included in the squad for this crucial match.
It was reported that the French star participated in Real Madrid training ahead of El Clasico. Therefore, fans were hopeful he might feature against Barcelona. However, Mbappe's name is absent from the list released by the club's press office.
According to reports, Mbappe suffered a hamstring injury in his left leg at the end of April. It appears the coaching staff decided not to risk the player. Regardless of the importance of El Clasico, rushing back from such an injury could lead to more serious problems later.
Meanwhile, midfielder Aurelien Tchouameni, who was fined 500,000 euros following an altercation with Federico Valverde, has been included in the squad. This shows that Alvaro Arbeloa continues to place his trust in the player. Despite recent discussions regarding internal team conflicts, Real Madrid must now focus entirely on the result on the pitch.
According to the provided information, the Real Madrid squad against Barcelona is as follows:
Goalkeepers: Courtois, Lunin, Sergio Mestre.
Defenders: Alaba, Trent, Asensio, A. Carreras, Fran Garcia, Rudiger, Huijsen, D. Jimenez.
Midfielders: Bellingham, Camavinga, Tchouameni, Tiago, Sestero, Palacios.
Forwards: Vini Junior, Gonzalo, Brahim, Mastantuono.
Head Coach: Alvaro Arbeloa.

This match will be one of the most important of the season for Real Madrid. The Madrid side will face Barcelona at the Camp Nou, and this game is significant not only for the three points but also for prestige, psychological advantage, and the final opportunities in the title race.
Mbappe's absence could have a serious impact on Real Madrid's attack. The French player can put immense pressure on any opponent's defense with his speed, individual skill, and composure in front of goal. Now, Arbeloa will have to rely on players like Vini Junior, Brahim, Gonzalo, and Mastantuono in attack.
The match kicks off at the Camp Nou stadium on the night of May 10 to 11 at 00:00 Tashkent time. El Clasico always brings great intrigue, pressure, and questions. This time, there are even more: can Real Madrid make a statement against Barcelona without Mbappe?
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