The new boss has stated that the gifted attacker is a unique talent.
The former Lyon boss has taken over at Villa Park following the sacking of Tim Sherwood, with a significant challenge ahead of him to avoid the Birmingham-based club being embroiled in a relegation battle this season.
Ahead of a daunting clash against Manchester City, Garde has been singing the praises of versatile attacker Grealish.
The 20-year-old is widely acknowledged as one of the most promising young players in the Premier League and has thrived in the Villa first team over the last year.
Garde has stated that Grealish has an important role to play if Villa are to get out of their current dire predicament.
"Jack is among the talented young players and of course he will have an important role,” The Express quote Garde as saying.
"With young players, you must have talent but there is far more to it than just that.
"Young players can be impatient If you don't have talent, you have no chance but you also have to put in a lot of hard training sessions."
Villa find themselves stranded on four points from their first 11 games, with a win over Bournemouth and draw against Sunderland the only matches that the club have taken points in this season.
Garde is a relatively inexperienced manager given that he has only coached Lyon for three years and has been out of the game since last season.