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Mexes and the rest of AC Milan's defensive side hold the keys to victory
To AC Milan, the key to victory is so simple it hurts: do not concede a goal.
A task easier said than done against a team that features Messi, Xavi, Iniesta, Fabregas and David Villa (not to mention Pedro, Tello and Sanchez).
So, there is no doubt AC Milan will have 10 players behind the ball in every single possession. Oh, and you can expect the Rossoneri to surround Messi with (at least) two or three players, too.
The strategy can lead to some potential pitfalls. For instance, AC Milan will allow Barcelona to have the ball at their feet for most of the game. That is a dangerous thing, as Xavi, Iniesta and Dani Alves are more than capable of finding open players in impossible positions for goals.
Of course, there is always Messi, who has the ability to dribble past defenders to create a shot for himself with ease.
With all that being said, it is still in Milan's best interest to adopt the defensive mentality. They will be pounded for 90 minutes, yes, but that is still a better alternative than going after the goal and inviting Barcelona to have space on Milan's side of the field.
For AC Milan, a 0-0 tie at the Camp Nou is equal to a victory.