Giggs made the number famous in the red of United, and this summer the shirt has now been handed down to young teen prodigy Greenwood.
"He's nearly already scored more goals than I did, so there's no pressure in that respect," Giggs told The Sun.
"But no, I don't think he'll feel the pressure of the number.
"He's a brilliant player, who I don't think he even looks like scoring every game — I think he's going to score two every game, he's that much of a threat.
"He's been playing off the right — eventually, I think he will go as a centre-forward.
"But he needs to go again. Opposition will be aware of him and they'll be trying to stop him."