Zinedine Zidane
Former Real Madrid, Juventus and France star
Zinedine Zidane: "All of us at Juventus agreed Manchester United were the best side we met in the Champions League.
"Giggs is truly world class."
Pedro
Barcelona's
Pedro: "He's a living legend and to play against him for someone like me, who has seen him play for so long, is a pleasure and a privilege.
"Giggs was very fast and attacking and I tried to focus on him (growing up).
"Now he plays more in the middle but he's very dangerous with the final ball."
Lauren
Former Arsenal defender Lauren: "I have come up against some tough wingers but the toughest of them all was Ryan Giggs.
"It was easy to read what other wingers would do but for Giggs, it was tough.
"He is very intelligent, takes you to the side, cuts inside, beating you - amazing player."
Marc Overmars
Ex-Arsenal and Holland winger Marc Overmars: "Ryan Giggs is fast, skillfull and sharp.
"With Luis Figo, he is the most fantastic winger I have ever seen in my life."
Ian Holloway
Ex-Crystal Palace boss and Mirror columnist Ian Holloway: "I'd like to say happy birthday to the greatest footballer this country has ever seen.
"I think anyone who loves football should raise a glass to this remarkable man."
Jean Tigana
Ex-Monaco and Fulham boss Jean Tigana: "Giggs is the detonator, the man who can make Manchester United explode."
Gary Lineker
Match of the Day host Gary Lineker: "His record is absolutely unbelievable.
"Not only longevity-wise, but the amount of things he's won, the amount of brilliant games, the amount of goals he's scored and created.
"He's just a brilliant professional and he's defying Father Time to play how he does at the very top level in club football."