Sir Alex Ferguson is scared Manchester United's cartoon defending is going to prove very costly in Sunday's Manchester derby.

Ferguson appeared to dash hopes of Nemanja Vidic returning to lend a hand when he ruled the Serbian out of Wednesday's Champions League encounter with CFR Cluj at Old Trafford.

United need some sort of assistance, though. In conceding 32 goals so far this season, including three in quite awful fashion at Reading on Saturday, Ferguson said he could not remember a time when his side's defence had been so leaky this side of Christmas. "It is a worry," said Ferguson.

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