"We are not singing and dancing about being top," he said. "We will sing and dance in May if we are still top. I would rather be there then. We just want to win that league."
"I don't know if it is just down to me and him being together," Ferdinand said of United's improvement. "The whole thing is not as fragmented this season.
"No matter what team you are, you are going to suffer when you don't have centre-backs playing in that position.
"But I am comfortable with Vida. We have played together for a few years. We know each other's games inside out and that feeds through to the other players."
United have not won at Stamford Bridge since 2002, but Ferdinand has been around too long to believe form will be a factor this weekend.
"Top-of-the-table clashes are about what happens on the day," he said. "The type of form you are in doesn't matter.
"There are enough players on the pitch to win the game. Whoever plays best on the day or gets that little bit of luck will come out winners.
"These kind of games are like auto-pilot. You don't have to think too much because you know each other's games so much.
"We have played against them loads in the last few years. They are a good side. We will never doubt that."