Mascherano ready to drop into Barcelona defence for Real Madrid showdown
Barca have been hit by a defensive injury crisis ahead of the semifinal.
Mascherano, who has played in defence recently to help cover the absentees, said on his club's website: "The important thing is to help the team in whatever position you are. "The coach decided to make this positional change, I've always said that I've come here to win. We need to do things in the best way possible."