Ferguson said: "Berbatov probably suffered from a lack of confidence last season, he didn't show it outwardly but it may have affected his inner thoughts.
"But we were a bit unfair to him last season because we asked him to play too deep. We thought that suited him because of how he played at Spurs, but we were wrong.
"We realise now he is at his best in the final third of the pitch, where he's a real threat. We know how to use him this season and he won't change from that.
"Part of the image problem he's had is that he has this languid style of running. But although he hasn't the pace of Cristiano Ronaldo or Nani, he's still quickish. He is probably as quick as Rooney."
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