The 29-year-old, who enjoyed a fruitful three-year spell with the Catalan side, is confident the reigning English champions can defeat their Spanish counterparts
The Spanish and English champions meet at the Bernabeu on Tuesday, with Jose Mourinho's side having endured a difficult start to their La Liga campaign.
Los Blancos are already eight points behind Barcelona in the race for the title but the Ivorian has maintained that he will not contact his old club to seek guidance on how to win.
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"I maintain contact with some ex-companions at Barca but I do not need their advice over Real," he told reporters.
"The City staff have prepared for this match in great detail and that’s enough information for us. Our last campaign was a disaster and we want to change all that.
"To win in the Bernabeu is a unique experience, enough to put you on the front pages. We shall put in our maximum to achieve that. So we shall be concentrating hard from the very first second.
"For me, the key to the result means winning the midfield battles with Xabi Alonso, Mesut Ozil and Sami Khedira. This is the key for the match."Unlike their opponents, City have begun the season in encouraging form and are yet to be beaten in the Premier League.