Even if Arsenal are not favorites against Sevilla, Arsenal will have to put in a great performance against Sevilla. No matter how Arsenal plan their other matches of the season, they will have to plan hard in this match and definitely play for the 3 points. Arsenal's Champions League survival depends on this one match. If Arsenal make a mistake in this match, they will have to wait another season. Not just waiting for one season but they have to do well in the Premier League and then secure the Champions League ticket. As this match is very important for Arsenal, I think Arsenal will not make mistakes in this match. Martinelli and Saka could be game changers for Arsenal. Martinelli and Saka are expected to be at their best against Sevilla.
I think Arsenal are favourites with the squad they have and I think they can really outtake Sevilla here without a doubt. However, it's a CL match so might be a surprise but Arsenal really are better in terms of squad and form as compared to Sevilla. It's just 2 matches in group rounds, so its not a dire situation for Arsenal yet but things will certainly look good for them if they can get wins from these early matches to move onto next stage comfortably. And with the squad they have they really should win these matches as they made some heavy transfers in last window just for these type of competitions.