The question for Ferguson now concerns who the job goes to Tuesday night.
Nemanja Vidic has been one of the better United players this season despite the problems Ferguson's side have experienced conceding late goals at Fulham and Everton, and has only just signed a four-year contract extension.
Ferdinand is also the current England skipper, even if his own injuries have restricted him to just two appearances since inheriting the armband from central defensive colleague John Terry.
Ferguson may take into account Ferdinand's fitness when reaching his conclusion, although for now, he is giving nothing away.
"Do you complicate things on purpose?" he laughed, when asked whether Ferdinand or Vidic was going to get the job.
"No comment. I haven't even discussed it."