Bruce was United skipper when Giggs made his breakthrough at United.
He told The Sun: “United had an amazing collection of kids.
“There were the Nevilles, who’ve had fantastic careers, Paul Scholes, a magician, David Beckham and Nicky Butt, but the one who stood out was Giggs.
“When players are 16 or 17 you can never quite judge it. You could never judge all those lads would do so well. They were good but the only one I’ve ever, ever seen who I knew was going to be a superstar was Ryan Giggs. He was that good.
“Now Ryan has to be one of the all-time greats. And to still be playing at the level he does with that enthusiasm is amazing. My first memory of him was when Fergie was nicking him from Man City and was saying we have got this young kid coming over so just be careful with him today.
“We thought ‘Oh well, he’s going to come and just join in with us’.
“Viv Anderson was then an England defender and he tells the story himself about how Ryan took the mickey out of him even when he came to us as a 14-year-old schoolboy.
“Ryan dribbled round him three times. I just went ‘wow’. I have never seen anyone as natural. Running, dribbling, it was just effortless for him.And he’s not big-time one little bit.”
Bruce will take his Sunderland side to Old Trafford on Saturday.