In Group B, there will be an interesting game between Arsenal and Sevilla, Sevilla fired their coach because of the bad performance they had in La Liga in the past and they surely want to get better results in the Champions League too but Arsenal is the team they won the game against Manchester City and in this season, Arsenal had an amazing performance so far which enough to say they won't have a hard game against Sevilla. The last time they faced each other was the Europe League in which Sevilla won the game and now this is a good chance for Arsenal to take revenge.
Even though Arsenal has a stronger chance of beating Sevilla in the Champions League, this match is extremely difficult to predict. Despite Sevilla's recent terrible performance, which led to the sacking of their coach, I don't think Arsenal will have an easy time winning them. They are the Europa League favourites, but now that they are in the Champions League, they will want to do everything they can to enhance their play in order to advance to the next round (knockout stage) of the competition. Arsenal will come for nothing less than a win, which means they will have to put in more effort in order to defeat Sevilla. Sevilla might still be regaining their form for now first since after sacking their coach but that is not enough condition to feel that Arsenal can win them easily in this match.