Man Utd boss Ferguson warns Vidic, Ferdinand place not guaranteed
Ferdinand, 32, skipper Vidic, 29, and the rest of the club's established stars know they have a new challenge on their hands to retain regular first-team football.
Ferguson said: "Rio and Nemanja are aware of the abilities of the young players. There is no question about that.
"When they are both fit, or one of them is, I will have a decision to make."
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