Since it's looking like they don't have a very good chance in their premier league games, they may try to see what they can do in the champions league where it looks like they have got better chance as it's looking like all the teams in the champions league has got equal chances since they are all still at the round of sixteen, beyond this stage we can tell teams with better potential in the champions league than others who may have managed to get pass the round of sixteen too.
It is true that Arsenal is indeed in the best performance in the Premier League won in the last 5 matches but this time the opponent is FC Porto a team that has a good record when playing at home, it's clear this isn't easy for Arsenal and I'm not sure Arsenal can win, it's possible this match will end in a draw. Arsenal can only take the opportunity when playing in the second leg therefore in the first leg Arsenal must try not to lose. I predict there will be more than 2 goals in this match because FC Porto always plays aggressively.