The England international fell slightly out of favour with Sir Alex Ferguson last term and has revealed the reasons why he considered leaving Old Trafford in the summer.
"Everyone at the club knew where I wanted to play and I think that's why I was disappointed," he told reporters.
"I got told to play in midfield and I didn't want to. I just think there had to come a point when, for my own career, I had to be a bit selfish really.
"I actually felt when I played in midfield I did OK, but I didn't want to play there. I've had no problem in the past playing out of position, but I felt I deserved the right to play in my position and that wasn't happening.
"I think, naturally, I was a bit disappointed and maybe that affected some of the games I played. I know myself that last year wasn't my best season but there were times when I was playing in different positions.
"I didn't feel I got a consistent run of games up front. Sometimes when you're not playing in one position all the time it's difficult to adapt."
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