The Welshman says that the new manager demands respect and feels that the squad are looking forward to making up for last season's disappointing Premier League campaign
The Dutchman took charge of the Red Devils for the first time on Thursday, overseeing a 7-0 pre-season friendly win over LA Galaxy.
Van Gaal has famously won titles with Ajax, Bayern Munich and Barcelona during his managerial career and Giggs is not surprised at his vast success.
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"They demand that the players respond and they demand respect. In the short space of time I have worked with Louis, you can see why he has been a success. He is infectious."
Giggs also revealed Van Gaal's meticulous planning and believes that the players are looking forward to making up for last season's disappointing campaign.
"He wants everything right from the first minute of training to the last," he added. "Everything we are working from is the blueprint he sent over from the World Cup, every minute of every session is laid down. Just everything he does is clear and everyone gets it straight away. He has a unique way of putting it over and it’s brilliant to see.
"It's quite simple but, if you make a mistake, he will tell you and, if you do something good, he will tell you. He makes no bones about who you are.
"I'm sure [the players] can't wait to get onto Old Trafford and produce the form they are all capable of."