"There's no particular season I've got in mind. I've got another year after this on my contract, and it will depend on my body, on how I feel, if I'm enjoying it. I'll take it all into consideration. I hope it doesn't, but if it ended tomorrow, I wouldn't swap my career for anyone's."
The Welshman could equal Sir Bobby Charlton's all-time club appearance record if he plays in all of United's remaining games this season, providing the Reds make it to the Champions League final.
"When it comes to personal records I've done my best to play things down - winning trophies matters most, it's as simple as that," he added. "That's the sole aim and if I pass milestones in the meantime, that's great."