Rooney has also revealed that his body is not as durable as it used to be, with 10 years at the top of his chosen profession having taken its toll.
"Physically I've taken a bit of a battering over the years; being lumped by Transformer-sized centre-backs or having my muscles smashed by falls, shoulder barges and last-ditch tackles, day in, day out, has left me a bit bruised," he said.
"When I get up in the morning after a game, I struggle to walk for the first half-an-hour. I ache a bit. It wasn't like that when I was a lad.
"I remember sometimes when I finished training or playing with Everton and United, I'd want to play some more. But football has had a massive impact on my body because my game is based on speed, power and intensity.
"Like any player I'm fearful of getting a career-ending injury. I could be in the best form of my life and then one day a bad tackle might finish my time in the sport. It's over then.
"But that's the risk I take as a player in every match. I know football is such a short career that one day, at any age, the game could be snatched from me unexpectedly.
"So I want to decide when I leave football, not a physio, or an opponent's boot."