Full defensive is very good tactical for FC Porto on second leg match against Arsenal, get capital winning over one goal and draw result on second leg match more enough for FC Porto qualifying to quarter final although Arsenal's advantage with playing in their home. I think will make frustrated with the opponent team when FC Porto make full defensive strategies on second leg match.
I think FC Porto can take advantage with counter attack with Arsenal will play more offensive make space with their defense position, be careful for Mikel Arteta if Porto will play more defensive and Arsenal payer get frustrated how difficult scoring goals make their defense players will leave their position.
I don't think it will be a very good plan if FC Porto is going to play more of defense in the returning leg again Arsenal at Emirate Stadium, the one goal victory that Porto got is not enough to see them progress to rhe next round this is because Arsenal will come all out with a lot of pressure to see if they can get an early goal then they will push attack but once they find it difficult to score they will fall back ro defend the one goal they have while they keep pushing to ensure they get a winner goal even they it won't be an easy game for them.
Arsenal was very outstanding in that match but they were just unlucky not to have scored any goal in that game while the goal of FC Porto came at the final minutes when no one expected it which gave Arsenal no time to fight back to equalize the goal. Just more minutes in that game, I am sure of an equalizer from Arsenal because they were playing better football than Porto and FC Porto made use of their home advantage to punish Arsenal and didn’t allow them to get a ball through into their net. The returning leg is going to be a very interesting match and I feel Arsenal can win the game and advance to the quarterfinals of the competition than FC Porto will do. Arsenal just need to give in their best in the returning leg which will be played at the Emirates Stadium and am home advantage to them. I hope they don’t take the match lightly because if they do, FC Porto will win and qualify for the next round of the champions league.