And on the five-year-old Marcus Rashford, attending his first ever game, it could not have made a deeper impression. My first ever game that I saw live, he was playing in it.
Rashford was in the stands as a five-year-old at Old Trafford as Ronaldo wrecked United's Champions League hopes with a stunning hat-trick back in 2003.
"I used to watch a lot of him growing up", he says. "I will always remember it". "All of his games".
"I've worked with Marcus and seen him at close hand and how much of a talent he is".
Why does this matter, nearly 15 years on from that famous hat-trick? Like Rashford, Ronaldo exploded onto the scene as a teenager, going to the 1994 World Cup with Brazil - even though he didn't play - before joining Dutch club PSV. - The Mirror. He went on to carry all before him for club and country, including two titles with Real Madrid, the Cup Winners' Cup and the Copa Del Rey with Barcelona and, of course, the World Cup with Brazil in 2002.
"He was obviously a top player who won a lot of things in his career", he said.
'So when you know he's saying good things about you then it really stands out'.
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And Giggs, speaking ahead of England's friendly with Brazil at Wembley, noted that Rashford's style is more exciting to watch.
'I think you [learn] naturally.
But in Ronaldo, he found a player he dreamed of one day emulating.
They are two special talents in their own right and will, as time goes by, find themselves moulded further by two very different managerial styles that, actually, you can not use as a basis for arguing about who is better than who. That is what sets the most risky strikers apart and why Rashford has an obviously special quality of his own.
"He always played free".
"No matter where he was playing, he went out there and expressed himself".
However, Giggs' comments have raised the eyebrows of football fans on social media, with many of them arguing that the likes of Jesus and Mbappe are superior players to Rashford.