I think just one defeat received by Real Madrid does not deserve to judge their performance too much. I agree about the player shopping that Ancelotti needs to do because that is the team's need to face the tight schedule of matches they play in several competitions at once.
Utilizing the squad available now is not the solution to targeting a trophy at the end of the season. With Real Madrid's 3-1 defeat last night, I think Ancelotti has realized what he has to do with the club management.
Atletico Madrid might be going through some problems but they are one of the best teams in La Liga. They have all of the best players that can take advantage of any lapses. The cause of this defeat is purely defensive. The central defenders couldn't handle the aerial balls coming from the flanks. García and Vázquez were under pressure during counterattacks but Rudiger and Alaba left some of Atletico's strikers unmarked. It is normal for big clubs like Madrid to lose games but their ability to put the loss behind them and keep winning future games is what will determine how they will end the season.
Los Blancos' loss of important players is seriously affecting the team, causing them to struggle in league games. However, they may be motivated to improve, having effective objectives to hit this season. Jude Bellingham contributed 0 shots on goal and only had one shot that was wide out. Diego Simeone's players didn't allow them a chance to breathe, kept pressing, and used their goal opportunities, Sául Nguez is MOTM, having delivered two fantastic assists to the frontlines and having complete control of the midfield. In the Madrid derby, Real Madrid was defeated by Atletico Madrid. Carlo Ancelotti's performance has dipped.
Vinicius Jr has recovered from his hamstring strain but he was sidelined from the game against Atletico due to sickness. Bellingham failed to deliver Real Madrid this time and the club will be hoping that Vinicius and other players will be fit for Los Blanco's subsequent games.