Dennis Schofield spotted Giggs' natural talent 32 years ago and believes the Welsh midfielder has several more playing years left in him.
"It makes me so proud whenever I see Ryan playing," said Schofield to the Mirror.
"I first saw him when I was working as a milkman and also doing work as a scout for City. I was driving in my milkfloat and all these kids were coming out of the local school in their kit.
"I parked up and watched them. This lad, an outside left, stood out. I thought 'Flipping heck, he's good'. He was like a gazelle, going up and down the line.
"I think he'll play for another five years. Not full games, but I think he'll be brought on when you need to control a game and see it out.
"He's as fit as any of the other players and I think United will keep him on and bring him on when they need to."
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