That would rule him out of games with Arsenal and Manchester City and probably the international friendly with Slovenia and the qualifier with Croatia, which could ensure England's place at the finals in South Africa.
Related ArticlesWigan v Man United previewFerdinand out for a monthLampard: United need MessiSport on televisionNemanja Vidic, who damaged his calf against Bayern Munich in the pre-season, hopes to return to United's defence at Wigan.
"He's got to start some time,'' said Ferguson. "He has been training for 10 days with us. What do we do? Keep training him until he's dead! You would always want Vidic in your team. ''
Ferguson dismissed talk of the Serb being unsettled.
"He has come out and denied he said these things. As far as I'm concerned he is here and he will be staying here.''
Vidic's return is well timed, as Jonny Evans has an ankle injury which will need surgery "at some point".