Manchester United boss Sir Alex Ferguson is wary of Manchester City's potent strike-force considering his own team's defensive frailties this season. The current league leaders have conceded 32 goals in all competitions this season, and Ferguson conceded: "It's a worry.

"If we perform like that on Sunday then God knows what's going to happen to us."

Speaking before Wednesday night's Champions League game against Romanian side CFR Cluj, Ferguson said: "When you see the goals against - we've lost 32 already - I can't remember us losing so many goals before Christmas.

"It's a concern, there's no question about that. When you see City have Balotelli, Dzeko - all really tall players - it's going to be a big challenge."

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