The former defender says that it will require 'almost a miracle' to save Villa from relegation this season.
The Frenchman was confirmed as Sherwood’s replacement on Monday evening and oversaw his new side as they were beaten 3-1 by Tottenham Hotspur at White Hart Lane.
Sherwood is well known for being one of the livelier managers on the touchline, but first impressions suggest that Garde will bring a more calm and patient approach to the role.
And Keown says that is how the two will differ, while also admitting that the new boss has his work cut out to turn things around.
“It is a great job but Garde has his work cut out,” he told the Daily Mail.
“In terms of temperament he will be very different to Tim Sherwood – just look at how calm he was during the game against Tottenham – but he will be taking in lots of information and formulating his ideas.”
The former Villa defender has also conceded that it will 'almost be a miracle' if Garde can save the side from relegation this season.
The Midlands outfit are currently rooted to the foot of the Premier League table and four points from safety, with Monday’s 3-1 defeat their seventh straight loss in the league.
Many have questioned whether their squad is good enough to avoid the drop, but Keown insists that there are some good players at Villa for Garde to work with.
“After the start they have made, it would almost be a miracle if Garde can keep them up. But it’s not impossible by any means,” he added.
“There are some good players at Villa, and some good staff too. Remi has to convince them to get on board with him, while others who have almost been frozen out will feel they have a second chance.”