"He was one of the most important players for Real Madrid and he is one of the most important players for Manchester United," Zabaleta told Sky Sports News.
"We're not going to be friends on the pitch, it is something that he understands. I think the players know we're not playing well, we're not performing and we have great players in the squad, but we're just 100% focused on Sunday.
"It is a game we need to win to get our confidence back and hopefully we can do it."
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