The match they will play tomorrow is critical because Chelsea is a team that is slowly starting to recover. Arsenal, which gained great morale by beating Manchester City, aims to keep its morale even higher by beating Chelsea. I think Arsenal can no longer be stopped by either Sevilla or Chelsea.
Crucial because Arsenal has very close points to Sevilla in the Champions League group standings so Arsenal will try to win so that their position is not taken over by another team or by Sevilla in the Champions League. Meanwhile, in the Premier League, Arsenal will also try to win as much as possible because the points are the same as the rivals above them, so Arsenal will try to win in order to become the leader of the standings, so these two matches are quite crucial for Arsenal this time.