The England star made his belated reappearance for the Red Devils as a last-gasp substitute in the 1-0 win at Sunderland on Sunday.
It meant a welcome return for the 29-year-old utility player, who had not featured for Sir Alex Ferguson's side since September 2008 following double knee surgery to cure a tendonitis problem.
The midfielder is now looking to push on and make the most of what is left of his career.
He told the club's official website: "I've missed two seasons and I'm disappointed about that. But I'm 29 and hopefully I've got another six to eight years left in me.
"Being out for so long is obviously not something I would have envisaged myself going through.
"It's been a learning experience and I try and take the positives from it.
"It was short (against Sunderland) but obviously I'm looking forward to next season.
"We've got our last game this weekend (against Stoke) and hopefully I'll play a bit again, and then hopefully get ready to attack next season."