Sabres goaltender Alex Lyon is in Buffalo for evaluation of his lower-body injury and is out indefinitely, coach Lindy Ruff said Wednesday before the team played the host Dallas Stars.

Lyon was injured Monday as the Sabres won 4-2 on the road against the St. Louis Blues for their ninth consecutive victory.

“We’ll let our doctors take a look,” Ruff said. “We know it’s going to be a bit of time.”

Lyon, who turned 33 on Dec. 9, won his last seven games. He is 10-6-3 with a 2.82 goals-against average and .906 save percentage in 21 games (19 starts) in his first season with Buffalo.

For his career, Lyon is 61-44-14 with a 2.96 GAA and .903 save percentage in 134 regular-season games (119 starts) for the Philadelphia Flyers (2017-21), Carolina Hurricanes (2021-22), Florida Panthers (2022-23), Detroit Red Wings (2023-25) and Sabres.

Ukko-Pekka Luukkonen (6-5-1, 2.58 GAA, .897 save percentage) moves up to Buffalo’s No. 1 goalie spot. Colten Ellis (4-3-0, 3.25 GAA, .895 save percentage) was set to be activated off injured reserve Wednesday and serve as Luukkonen’s backup.

Ellis had been in concussion protocol since Dec. 9 when the Sabres won 4-3 in overtime at Edmonton.

–Field Level Media