Ferguson has praised Andre Villas-Boas' management of the striker.
He said: â€œThey are going to be a challenge for that top-four position. The lad Defoe has had an incredible season. Thereâ€™s been goals for him.
â€œThey signed Emmanuel Adebayor from City and he never played him. He kept playing Defoe all the time and I think itâ€™s given the boy confidence. So he has done very well. Adebayorâ€™s away to the African Nations Cup so they donâ€™t have him but they have Dempsey. Itâ€™s a strong squad.
â€œDown there, there seems to be a lot of goals in the games. White Hart Laneâ€™s a good ground for us and Spurs are always going to have a go at you."