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GK: Iker Casillas (Captain)
RB: Álvaro Arbeloa
CB: Pepe, Ricardo Carvalho
RDM: Sami Khedira
LDM: Xabi Alonso
CAM: Mesut Özil
RW: Cristiano Ronaldo
LW: Fábio Coentrão
ST: Karim Benzema
Madrid excelled playing in Mourinho's 4-2-3-1 this summer. The Portuguese tactician did not experiment with other systems in the seven preseason matches, which makes it likely that he will be using this starting XI on Sunday.
Although Fábio Coentrão was impressive as a defensive midfielder, he also played well out wide. The Portuguese star started Madrid's first preseason match as a left-winger.
Coentrão began his career as a winger, transitioning to left-back in 2009. He contributes on both sides of the ball, tracking back defensively and getting forward as well.
In this formation, Coentrão and Marcelo would form a dynamic duo on the left flank. The former Benfica star would provide cover and support for the Madrid left-back. When Barcelona are in possession, Dani Alves consistently pushes forward down the right. With Coentrão playing as a left-winger, he will be able to help Marcelo contain the Barcelona right-back.
Although Coentrão would improve Madrid defensively, his skill-set and style of play give the team more fluidity in the attack. When Marcelo bursts forward from his left-back position, the Portuguese international can drop back and provide cover.
With two interchangeable wing-backs on the left, Madrid will be less predictable going forward. Marcelo has the freedom to take risks in the final third, knowing that Coentrão will easily slot in at left-back.
Pepe was sensational in his defensive midfield role last season, but Mourinho will probably want to keep the Portuguese enforcer and Ricardo Carvalho together in central defense. Pepe has performed well at the back this summer, and Madrid will need his recovery pace to cope with Barcelona's quick attackers.
Ángel di María was a key figure for Los Merengues in his debut season. He was the first-choice right-winger, playing opposite of Cristiano Ronaldo. The Argentine performed well against Barcelona in the Copa del Rey Final, providing the key assist.
Although the Argentine international is more dangerous in the attack, Coentrão could be one of Mourinho's starting wingers for the Supercopa. The Portuguese star has better defensive abilities and featured heavily in Madrid's preseason tour. Di María, on the other hand, joined the squad late due to his involvement at the 2011 Copa América.
Mourinho has been consistent with his 4-2-3-1, making this a likely starting XI for the first leg of the Supercopa.