Writing for 'Sky Sports', the Welsh wing wizard hailed Rashford, who has scored seven goals and laid on six more in his 18 appearances for the 'Red Devils' so far this season.
Giggs is intrigued to see how the 20-year-old measures up against Manchester City counterpart Gabriel Jesus when the pair go head-to-head when England face Brazil on Tuesday but insists that he would not swap Rashford for the Samba star, or any other young player for that matter.
"It will be interesting to see Marcus Rashford and Gabriel Jesus come up against each other at Wembley for England v Brazil. I think the word for these two players is exciting," he wrote in his 'Class of 92' column.
"They're a bit different, Jesus has a better scoring record but Marcus likes to match up with defenders and try something, which is what makes him great to watch.
"I've worked with Marcus and seen him at close hand and how much of a talent he is. However, it is his work rate and commitment which are really what makes him such a valuable asset for Manchester United.
"You wouldn't swap him for any other young player right now. I've not seen Jesus in the same close-up environment but he's obviously shown from his performances he is a very talented player."
Saying that he would not swap Rashford for any other young player in the world right now is some vote of confidence from Giggs, and the youngster will no doubt be keen to show that the former United man is right to have such confidence in him.