Baertschi suffered a hip flexor injury in practice Tuesday and is listed by the team as week-to-week.
"I was skating and my left skate seemed to have caught a rut in the ice and my legs kind of went into a splits position," Baertschi said in a statement. "I felt pain immediately and left the ice to have it checked. It’s very disappointing to learn that it’s a hip flexor injury that will keep me out of the lineup.”
Coach Bob Hartley said he will soldier on without the 20-year-old.
"You can't win with the players you don't have," Hartley said. "You play with the 20 bodies that you have in your lineup. Sven is capable of many great things, but we believe in everyone in this lineup. It's not a one-man show. It's about being a team. There's always a good and a bad part to injuries. The bad part is the player can't play. The good part, it gives opportunities to others to get some roles, to get some responsibilities."
Here are the Flames' lines against the Avalanche as Calgary looks for its second consecutive win of the season: