Napoli have lost their potential this season after becoming champions.They are playing a football game that is far away from the football they played in that season when they were champions and we can see it very easily in the league.I can say that it is a miracle for them that they drew 1-1 against Barcelona in this match.They didn't do much during the match but at least they had a chance again for the round.Barcelona will most probably defeat Napoli at home and will pass the round.Although Napoli got a draw here, I don't think they have any chance on the road.
As for Arsenal, I don't think anyone really expected them to lose in this match.They have a good squad and the Portuguese teams haven't performed well so far but they have experience.I expect Arsenal to win at home and go through.
The chance for Napoli to win in the second leg is very small. Although that doesn't mean they don't have a chance, it's just that the chance is very small. In contrast to Arsenal, even though today they lost in the first leg, I'm sure they are still optimistic about turning things around in the second leg. But the problem is that Porto's defense is quite famous for its solidity. And it's possible that Porto will try to survive in the second leg and make it even more difficult for Arsenal to score goals. And if Arsenal is careless, Arsenal could even concede in the second leg.
Honestly, I hope Arsenal scores lots of goals in this match. But I was quite disappointed because Arsenal was really unable to break down the opponent's defense.