Giggs will play on next season after agreeing a new 12-month contract.
"It's good news for him, for the club and the players," Nani told United Review.
"He has so much experience and can give a lot to the club. He's still amazing on the pitch so it's very good news. It's been amazing being at the club with him and I've learned a lot. He brings a lot of experience to the training pitch and onto the field and he helps a lot of the young lads. It's nice to know he'll be around for at least another year."