Berbatov scored twice and Wayne Rooney had one disallowed before continuing his prolific form with the third.

Both of Berbatov's close-range efforts looked marginally offside but the Bulgarian said: "It's not my decision to make, I am trying to score, it's for the referee and he said no offside.

"It was great for me to score again here and importantly we won the game."

Asked if he felt he was improving as a player since his move from Tottenham, Berbatov added on ITV1: "I will improve, that's why I'm here at the biggest club and everything is working right at the moment.

"You must be always 100% in the game and that's what I'm doing, in the past I lacked that in some games."

United manager Sir Alex Ferguson was also delighted with Berbatov's performance, adding: "It was fantastic, a marvellous performance again.

"He is bringing that composure to the final third of the field. Hopefully the combination is developing with not only Wayne but also Carlos (Tevez), but he had a little hip injury tonight so we took him off."