Sir Alex Ferguson believes Manchester United veterans Ryan Giggs and Paul Scholes can play in the Premier League until they're at least 40-years-old.

The physical demands on a modern-day player has increased exponentially over the seasons, but the Red Devils midfield duo's longevity in the top flight has been something to behold.

Giggs, who will turn 39 in November, and Scholes, who would have celebrated his 38th birthday 13 days earlier, remain crucial members of Ferguson's side ahead of the 2012/13 campaign.

The United boss is banking on squeezing one more season out of Scholes, and two more from Giggs, the former having come out of retirement last term to aid his one-and-only club.

"He (Scholes) will be 38 in November and like any player of that age we know that his legs will go eventually," said Ferguson.

"But, as we have seen so often, there is no-one else in England who can dictate the pace, rhythm and tempo of a game and control that midfield area the way he does.

"If we can get a good season out of Paul he will be satisfied with himself.

"On the other hand, Ryan can play for another year after this."

Giggs became United's most capped player of all-time when the Welshman made his 900th appearance on February 26 against Norwich, while Scholes is third on the Old Trafford outfit's record appearance list (696).