The Dutch striker was lethal in the box for United, scoring 150 goals in 219 games for the Red Devils between 2001 and 2006,
Greenwood is only 19 and already had 17 goals to his name, and Ferdinand is excited by his potential.
Speaking after United's win over Istanbul Basaksehir, Ferdinand told BT Sport: "He looked very sharp. The passing forward in the No.10 spot, Van de Beek coming in there, and it just again showed his difference. Daniel James looked impressive when he came on too.
"He's going to be a beast to go with the technique he's got, the understanding, his spatial awareness, he plays off both feet.
"I want to go and watch training. That's what he gets out of me. I want to go and watch his technique, him lashing balls into the back of the net.
"We talk about Ruud van Nistelrooy, it excites you when you see finishers that finish aggressively, but with precision. He has that in abundance."