I really understand that Porto's defense is very strong. At least Mikel Arteta can find a gap to score a goal in the second leg to advance to the next round. Even though Porto is in third place in the Portuguese League, that cannot be a benchmark for measuring the strength of a club. However, here you can see or find out who will be lucky in the second leg, hopefully Mikel Arteta can find Porto's weak points so they can win or turn things around.
Now things are not easy for the Arsenal in this second leg game because they are surely now on back-foot, and they have to give their best for the chance of going into next round which could be not easy as we have Porto into first leg surely now Mikel Arteta need to be more aggressive and better because if they fail this could be big upset for them while they are already having result like this in last season when they lost against another Portuguese side in Europa League so here we can expect another backlash like this.
Even mostly are feeling Arsenal are better and solid but still on match-day things can take turn and Porto can create big trouble for them in London with we know Mikel Arteta were overconfidence, but now he is surely understand ground realities and will not allow them to have another setback for the Gunners.