He told the Manchester Evening News: "You know at Manchester United that every year they will sign world-class players. It's an education that makes you mentally strong.
"But you know you are still not guaranteed a start the following Saturday, and that makes you mentally strong. That is probably how I got through my injuries.
"It's a short career and you have to try to take every opportunity when it comes. That's how I was brought up; how I've been since I was a kid. I will never lose that."
But after bravely battling back from that serious injury at Anfield in early 2006, he's hoping that he'll get a new Old Trafford contract rather than a new club.
"I have a contract re-negotiation coming up," he added.
"I was due contract talks last year and we decided, the club and myself, that I wouldn't do that when I was injured, because it wasn't fair on them.
"But now I am fit and ready to commit my future. I want to stay at United.
"My agent has spoken with the club and the talks should happen in the next few weeks."