Manchester United boss Sir Alex Ferguson has cast doubt on Wayne Rooney's goalscoring ability.

With United 2-1 down at West Ham United, Rooney was replaced by Ryan Giggs in the 71st minute.

Ferguson said: "As far as taking him off on Wednesday, it's simply because he wasn't playing as well as Shinji was.

"We had to get that goal that mattered and of course there are so many games Wayne Rooney is better than most players. But on the night Shinji was playing so well."