Manchester United striker Wayne Rooney has admitted that handing in his transfer request two years ago was the biggest mistake of his career.

Rooney is currently promoting his latest autobiography, My Decade in the Premier League, which is also being serialised by the Daily Mirror.

In the latest extract, Rooney admits he regretted asking for a transfer.

Rooney issued a statement in September 2010 in which he questioned United’s ability to attract top players and indicated he wanted to leave.

Two days later, though, he performed a dramatic U-turn and signed a new five-year contract.

He wrote: “In September 2010 my ankle puts me on the sidelines. I get frustrated with myself, my game, my injury, and everything around me. I’m stuck in a cycle of bad form but I can’t get out of it.

“And that’s when I make the biggest mistake of my career.

“In October, I release a statement which publicly questions my happiness at Old Trafford. Am I better off elsewhere?”

He continued: “Then the manager has his say. ‘Sometimes you look in a field and you see a cow and you think it’s a better cow than the one you have in your own field. And it never really works that way’.

“He’s saying the grass isn’t always greener, and he’s right.

“I like what’s in my field. I’m wrong. United want the same as me: trophies, success, to be the best.”

Meanwhile, Rooney said that his recovery is on track after suffering a gash to his leg in a tackle against Fulham a fortnight ago.

“The injury is going well. It could have been a lot worse than what it was. It is up to the doctor. When he declares me fit I will be ready.

“What I don’t want to happen is to come back too early when it is not quite healed and it opens up again in my first game. That would just set me back again another four weeks.

“Overall, I think at the most I will miss four games.”