The Los Blancos coach has been in touch with his old player to give him some guidance on how to beat the Rojiblancos - though he is full of praise for Diego Simeone's Spanish side
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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."