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Atlético de Madrid team news
Just when it appeared that both lineups were clear, the latest news from Atlético's camp indicate that Guilherme Siqueira will start in Jesús Gámez's spot. Although Siqueira has not been performing well this season -- in fact, he was left out of the squad for the Round of 16 matches --, this call is reasonable, as he's a pure left-back while Gámez has played his whole career on the right.
Tiago and Suárez are also fighting for a starting spot, and it will be interesting to see who starts with Gabi.
Real Madrid team news
The only question in Real Madrid's lineup is Isco's role. The Andalusian playmaker will almost certainly start the game on the bench but could be used as a game-changer if needed. He succeeded in that role against Atlético last season and while some Real Madrid fans want to see him in the starting lineup, Ancelotti will definitely be happy about having a player of his caliber on the bench. Pepe has recovered well from his injury and will be starting alongside Sergio Ramos.