Manchester City boss Roberto Mancini has identified Cristiano Ronaldo has Real Madrid's biggest threat tomorrow night.

City host the Spanish champions in a must-win fixture on Match Day 5 of the Champions League and Mancini knows very well that Portuguese star Ronaldo needs to be held for his side to have any chance of keeping their hopes of progress to the knockout phase alive.

"I think (it is) not only tomorrow night - I think Ronaldo has a big impact on every game," said Mancini.

"One player that scores every game, one or two goals, is an incredible player.

"For this reason we should have more attention on him because he is a player that can change the game."

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