It would be an easy 90 minute win for Arsenal. Porto might have a lead over goal but they are no match to what Arsenal is now. The next game is going to be in a much different context as well. Arsenal has placed themselves as the contender for title of the premier league and the match is being hosted in Etihad stadium, the home ground of Arsenal. Arsenal will most probably have a better aggregate than porto during the gameplay and advance to the next round.
Arsenal should have the better advantage because they have being playing very well and have players on form also they have a better squad but I think Porto will win or draw. Porto have a one goal deposit and they'll have the confidence that they can win arsenal as they did in the first leg o feel they'll advance because they're being underrated. If they can draw against arsenal at their home, they'll be advancing and I think Porto will go arsenal home looking to just have a draw. Porto hasn't stopped playing well in their league as they have being winning and with that momentum of wins, I think arsenal is going to have a hard time playing them. I love arsenal and it has being very long I watched them playing this well, I just hope they can perform as well as they have being doing when they play tomorrow.