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.
After what happened to Sevilla and all the problems they had, including financial problems, I see it very difficult for them to be able to beat an Arsenal team that needs to win at all costs.
It is no coincidence that bookmakers agree with me in this assessment. In fact, Arsenal are the favorite team to win.