Hernandez did not score a goal when United only drew 2-2 with Fulham at Craven Cottage last weekend. Nevertheless, Giggs rate Mexican players have shown great progress for the club.
Hernandez scored his first goal for United against Chelsea in the Community Shield.
"He has a big impact at the club," Giggs said the club's official website.
"He still needs to learn, not just a matter of playing on the field, but also personality off the field. He is a figure full of excited, and we were happy when he was in the locker room."
"Very easy to find out about him because he speaks English very good. He has joined with us, and I am sure he will help a lot." said Giggs.
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