Manchester United boss Sir Alex Ferguson feels Ryan Giggs will prove a one-off.

He is the only player to have scored in all 20 seasons of the new league and has already agreed to extend his career by another season as he continues to defy the ageing process.

Ferguson said: "It is my personal view, and not everyone will agree with me because we all have our favourites, that even if you take away the longevity, being in the Premier League for as long as he has, achieving what he has; no other player will do it."