Costa, who is frequently linked with a Premier League move, wants to reach the quarter-finals at Arsenal's expense.
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Costa told reporters: They are quite offensive but we will explore those weaker points in their game. Of course they have weaknesses and of course I'm not going to say what they are.
But we will approach every game the same - to go out and win. We do not care if we are playing Arouca or Arsenal, we go out to win every match. A team like Porto always plays to win.
We would never look differently or approach a game differently because of who we are playing."