Arsenal have a good chance in both EPL and the Europa League. Yes, they lost yo PSV in Netherland but you cant win every game. Arsenal have the youngest squad in the EPL they have been managing to win games even with their lack of depth and we dont even appreciate them enough. Out of the 9 games in October, they won 7, lost 1 and had one draw. This shows that theyre trying and Chelseas game wont be that much of a challenge considering their form.
It doesn't matter if he lose against PSV since they already have enough score to qualify for the top 16 on the Europa League, moreover their next match is against Zurich which is the weakest club on Group A. It will be an easy win for Arsenal and they will remain the top 1 position.
Chelsea aren't in good condition, they're keep draw for the past 2 matches and lose, I don't think Chelsea will beat Arsenal even though the match will happen on Chelsea's home.