Premier League – Ferguson: Rooney wants to leave
"We are as bemused as anyone can be, we can’t quite understand why he would want to leave," Ferguson said.
Ferguson said Rooney’s agent broke off contract talks with chief executive David Gill after the World Cup, and the player confirmed his intention to leave in a subsequent meeting.
"I was in the office on August 14 and David phoned me to say he wasn’t signing a contract," Ferguson told MUTV. "He came across to see me and said ‘I can’t believe this’. I could not believe it. I was dumbfounded.
"Only months before he was saying this was the greatest club in the world and he wanted to stay for life.
"We just don’t know what’s changed the boy’s mind really."
He insisted he had not fallen out with Rooney over a recent ankle injury, but said he was disappointed with the player’s insistence he was not injured.
"I knew very well that he was carrying an injury, we sent him for a scan which showed a minor defect, nothing serious but it needed treatment, and he had treatment."
Ferguson said he had no idea why Rooney wanted to leave, but would leave the door open for him to change his mind, "simply because he is such a good player".
"We’ve done nothing but help him since he’s been at this club."
Rooney joined the club from Everton in 2004 as an 18-year-old for £27m, a world record for a player aged under 20.
He helped them to Premier League titles in 2007, 2008 and 2009 and the Champions League in 2008.
The manager said Rooney would not play in Wednesday’s Champions League match against Bursaspor because of an ankle injury.
A United press officer said that Rooney was stretchered off at the end of training on Tuesday.