This game is a tricky game for arsenal because they are coming against one of the best attacking teams in Europe if not the best so arsenal has to play with caution because going all out in a attacking formation is not a wise on for arsenal as a team because they don't have what It takes to sustain that style of football in the 90minutes of the game.
The best approach for arsenal is to wait for Madrid and get them on the counter this game will be decided on the mid field so if arsenal can try and win the game on the midfield it will be of help to them because if players like Thomas paty can be effective in the middle then the chances of arsenal winning this game will be high
It is a very tricky game. Indeed, and that's why Arsenal had to give away their Premier League match against Everton for the full preparation of the match against Real Madrid. They know what's really involved in the match, to play against a defending champion. They have to give all their might to win in the first leg because it is as if the Champions League is where their whole hope is, to make a mark in that area since the Premier League is becoming far from their reach to lift it.