Arsenal first match in this competition and they will fight against PSV and this is very interesting because both teams have been met last year on Europa league and both teams have defeated each other which mean PSV can be considers as tough opponent for Arsenal especially PSV performance were increase rapidly because since July PSV has fantastic achievement and since that month PSV has through 11 matches with unbeatable status in all competitions and before they advances to the group stage PSV has been done a good job because they can able to eliminate Rangers with total aggregate 7-2 so although Arsenal is the favourite in this match but PSV cannot be underestimate because they have a potention to make Arsenal get in trouble
Arsenal still came out first in their group stage of Europa League while PSV follow suit after they played the play off but were drop out and Arsenal proceeded until the knockout stage. However, what I fear is what PSV did to get to the Champions League this season, they had an incredible performance in the playoff again and got into the group B, those goals aren't the type for Novice and seeing how they are also toping their domestic league makes me doubt how Arsenal is going to win them, more work need to be done to win this match.
If things get worse, I just have this believe fr Arsenal and PSV to make it out of the group B even if they win each other, they can still recover with rest of the remaining team to proceed out time group stage but were I think main problem will arise is in that knockout stage, it's going to be shoulder for shoulder match.