Real Madrid were lucky to get a win after losing a key player in the first half. This is my first time seeing Kylian Mbappe acting stupid like this. As a result, Mbappe will most likely be suspended for the next 2 weeks which means he may not be eligible to play in the second leg of the Champions League against Arsenal in Santiago Bernabeu.
The Champions League and La Liga are different competitions, so the fact that Mbappe received a red card in a La Liga game will not affect his participation in the Champions League.
] and even this is his first red card at Real Madrid and his first red card after 6 years, the last one was in the Coupe de France match in 2019. Yes, and fortunately, Real Madrid had led 0-1 just before the red card happened.
This will be quite bad for Real Madrid's performance going forward with Mbappe's absence for several matches. But as you said, La Liga matches are different from UCL, so red cards in La Liga do not apply in UCL and Mbappe can still be in the UCL lineup when facing Arsenal later.
Source: Mbappé sees red