Arsenal is currently in so much set back and they really need to fix up else they may end up just amongst top five as Manchester city, Liverpool and others are really get in the race to the top so will not letting any opportunity to move ahead get pass them, Liverpool is bent on staying at the top and in their recent performance they have really been performing brilliantly and maintaining their top position well enough but they still need some consistency or else Manchester city will take over leaving them at the second position on the table..
currently, Arsenal is experiencing a fairly deep decline in performance, even in EPL matches they have shown very bad performances lately, but we dont know what will happen next when competing in the UCL because performance in the EPL does not provide a guarantee that they will perform badly in the UCL because all the teams entering the next round in the UCL will definitely try as hard as possible to get through to the final round, even though it is impossible, at least there is strong resistance from Arsenal.
this time I really doubt Arteta team, which at this time cannot be confirmed as to whether the cause of the decline in performance in the domestic league is whether this is just a strategy to maintain the physical stability of the players or whether some of the players are injured or have experienced fatigue, but what is certain is that competing against Porto is a task which is very difficult because even though Porto is not very popular, this team could beat Arsenal with the strong defense that Porto currently has and even the attack line that looks ordinary but actually Porto attack line is very sharp.