The centre-back already faces a battle with Steven Gerrard for
the England armband after missing the World Cup through
injury.
And Old Trafford manager Alex Ferguson insisted: "Nemanja Vidic
has been given the captain's armband because he has been available
all the time."
Ferdinand, 31, has never been United's official skipper but he
has led the team out many times because of club captain Gary
Neville's injury woes.
And many fans expected him to get the nod - particularly when he
was given the honour against Rangers in midweek.
But now Ferguson has confirmed it will be fellow defender Vidic,
28, who carries out the duties on a more regular basis.
Fergie said: "We want it to be a player who's consistently
available for us.
"Everyone will recognise that if Vidic is fit - and he has been
all season - he'll always be there.
"You wouldn't leave him out of your team unless you were resting
him.
"He has started the campaign as the captain and it will stay
that way."
Fergie's decision suggests that Ferdinand has some way to go
before convincing the boss he is completely clear of
injuries.
But the Old Trafford chief is pleased to have him available for
tomorrow's clash with Liverpool.
Fergie added: "It is good to have Rio back. If he plays, it is
because he is an outstanding player.