If arsenal can be able to hold back vinicius and mbappe then they can maybe upset at the attack since Saka is back arsenal can be able to utilize their attacking force and the defensive error that have been befallen the Real Madrid back but the thing is that Madrid can be a totally different team when it comes to the champions league and they have proven it times without number.
Saka is the biggest threat for Madrid, but hope they can handle him well. I don't really trust madrid's defenders, but just support them to handle Saka.
They can always focus on him as he's Arsenal's main player when building an attack. They often flanked from his side, and rarely did it through Martinelli.
As long as they can kill his movement, they can secure good result in this away game.