Marcus Rashford made his debut for Manchester United last year in February and has continued to impress.
Louis van Gaal had to utilise the youngster due to a squad that depleted due to injury and he has become a regular in the first team since then.
Rashford went on to represent England at the Euros and even this season has not been a revelation, Rashford believes he is an exciting prospect for the future .
Giggs told PA Sport: “I remember watching him the week before [his debut], it may have even been three or four days before that game, training with the reserves.
“He obviously stood out and he looked sharp but, little did we know that three or four days later, he would be starring and ending the season so well and then going onto the Euros with England.
“He is an exciting prospect. He’s just so quick and direct. His best position, really, is through the middle, coming up with the goods and he is just an exciting player.
“I always say he is a Man United player because he is exciting, he has got a good mentality and he is tough. I think he’ll do well at United for a long, long time.”