Manchester City boss Roberto Mancini says 'concentration' is the key as they look keep Cristiano Ronaldo at bay.
The Portuguese superstar returns to Manchester on Wednesday for the first time since leaving United three years ago as Real Madrid head for the Etihad Stadium.
Real are on the cusp of qualifying for the knockout phase and anything other than a City win will see Mancini's side go out in the group stage for the second successive year.
And Mancini admits that Ronaldo - who he tips to win the Ballon D'Or - is almost impossible to stop.
"How do we stop him? Maybe we'll call the police," joked the City boss.
"He's a top player and, when you come up against someone who can score one or two goals every game, it is difficult. We will need to concentrate.
"For me Ronaldo deserves to win the Ballon D'Or. He scored so many goals last year and that helped Madrid finish above Barcelona.
"But I hope he can have a bad night on Wednesday. Maybe they can leave him at home."