Real boss Carlo Ancelotti is preparing to face his former employers when locking horns with Napoli, and he has said of a heavyweight encounter with the Serie A title holders: "Napoli are one of the best teams in Italy. They've maintained the same structure [under new coach Rudi Garcia]. They have a high level, they have individuals, and an atmosphere which pushes them. It's a return to the past. I had positive moments there, in a marvellous city. Some good moments, some less good. It's the most difficult game in the group."