Not only is the Dutchman top of the Reds scoring charts this terms with ten goals, he has been the provider for many of United's strikes from set-pieces.
Giggs says having a player of van Persie's quality has boosted the whole squad and he hopes the striker can maintain his good form in the coming weeks.
"When a ready-made, world-class player comes into the team it gives everybody a lift," Giggs told ManUtd.com and PA Sport.
"We’re like the supporters – we look forward to playing with and seeing quality players come into the team. Robin is certainly that – he’s proven that with his goals and all-round play since he’s come to the club.
"Robin’s set-piece delivery has been really important to us. It’s a big plus this season that we’re scoring from set-pieces and corners. That’s something we haven’t done over the last few years as often as we’d have liked.
"So with Robin it’s not just goals you get. He’s helped add more goals to the scoresheet and helped a few different names get on there."