Giggs believes the 23-year-old is capable of scoring more than 20 goals a season for United.
“I think Nani is ready to step up to that next level now. He has always been a match-winner but he needs to do it consistently,” Giggs said in The People.
“This season he has already made seven or eight goals and scored a couple but he can do better as well and improve and there is more to come.
“He’s definitely beginning to add something that perhaps we lacked since Cristiano left and he’s filling that gap better now. Those strikes from outside the box and the type of run and goal we saw at Bolton recently show that he’s got that in him.
“What he needs to do now is add more goals to his game. He needs to score 20 goals a season and make 20 goals. If he does that, and he is capable of it, that is all you can ask from a wide player.
“I am obviously one of the senior players here now and I speak to the wingers all the time about positional play. When they first come they probably don’t know their defensive duties as well in 4-4-2.
“But I’ve played a lot of that and I understand what is needed from a player who plays out wide and has an attacking role. You speak to those in your position all the time and Nani is very good at listening to that kind of advice.
“I have experience to pass on to the younger players and I do that with Nani. He needs to get more composure in the final third but he is still relatively young and I am certain he will add more goals to his game.”