Napoli go to Madrid on Wednesday.
Ex-Real coach Capello said: â€œNapoli will have to be very careful, not only in the first 15 minutes.
â€œThey'll need to be good in order to avoid suffering when Real Madrid have the ball.
â€œFans of Los Merengues are used to always winning and seeing great football, so they could whistle a bit if Napoli take the game to [Madrid].
â€œThey have important players like Marcelo and Kroos, who are good at playing the ball in behind and this could be an important tactic.
â€œThe full-backs Marcelo and Carvajal will play very wide and their switches in play can be problematic [for Napoli].
"Napoli should always play ball the forward quickly and never go backwards.
â€œIs it better to control the game or try to play it? They could try to impose their game at the Bernabeu, but they'll be faced by star players. Good luck to Napoli."