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.
Usually what is often taken for granted will always give unexpected surprises. Arsenal will play away against Chelsea and everyone knows that Chelsea have won at Arsenal, and vice versa. So it would be very fatal if Arsenal underestimated Chelsea just because of Chelsea's erratic performance this season, because Chelsea could have won unexpectedly against a big team like Arsenal.