Real Madrid coach Carlo Ancelotti has revealed that he has given AC Milan boss Clarence Seedorf advice as to how to beat Atletico Madrid.
Los Blancos overcame their city rivals 5-0 over two legs in the Copa del Rey earlier this month, and Diego Simeone's men now face off with the Rossoneri in the Champions League on Wednesday.
Seedorf played under Ancelotti during his time at San Siro and the Italian says his old charge has been in touch over how to best the capital club.
"He's a partner and a friend," Ancelotti told the Corriere dello Sport.
"It was inevitable that he'd request information. He knows how to deal with it. He's completely into his role. He has great ideas.
"Atletico play in the image of their coach. I remember Simeone as a player. He's smart tactically and gave it all. So his team are like him: strong, compact, with the mentality of a fighter.
"Milan must be careful about the counterattack and set pieces."