The 38-year-old Welshman, who is the most decorated player in English football history, is in his 22nd season with the Red Devils and Neville thinks that he is far from finished.
"Will we ever see his like again? No, no way," said Neville.
"Ryan Giggs will go down as the most successful British footballer of all time and I cannot see anyone ever overtaking him. He's on the brink of his 13th league title, after all.
"Ryan is unique, he has surpassed all records in terms of domestic titles and he has incredible desire, quality and spirit. He's just fantastic to watch. Ryan is 38 years old, and he will contribute at the age of 42 if he wants to, the way his body is right now, the way his football is and the quality he still has."
Giggs signed a one-year contract extension in February that will keep him at the club until the summer of 2013.