Both were activated before the team's game Friday night against the Vancouver Canucks.
Galiardi has missed nine games since injuring his ankle Oct. 28 at Calgary. He has one goal and five assists for Colorado this season.
Liles missed five games after injuring his shoulder Nov. 6 against Chicago. He has two goals and three assists for the Avalanche this season.
The Avalanche also reassigned forward Chris Durno to the Lake Erie Monsters of the American Hockey League on Friday and placed forward Matt Hendricks on the injured reserve list retroactive to Nov. 14 with a groin injury.
Not only is it a great idea, but if you don't [start using analytics] you're going to fall behind. You have to be on the cutting edge. It was [Arizona Coyotes assistant general manager] Darcy Regier who said, 'If you didn't invent it, you have to be the second- or third-best copier, because if you're fourth or fifth you've got no chance.'
— Detroit Red Wings coach Mike Babcock on his interest in advanced statistical analysis