Man Utd boss Ferguson admits Vidic, Ferdinand cannot play together
And boss Fergie revealed: "I had my doubts about whether I was doing the right thing or not because he was fantastic against Everton, but I stuck by what we've been doing with him.
"Three days to my mind was a risk.
"It would have been the same for Ferdinand.
"If he had played on the Sunday I would have had my doubts whether to play him on Wednesday."