Buffalo Sabres coach Lindy Ruff says defenseman Mattias Samuelsson is out indefinitely with a lower-body injury. Ruff called the severity of the injury “pretty strong."

Thompson exited Monday’s game against Montreal with a lower-body injury following his first shift of the second period. Luukkonen played the first two periods of that game but was replaced by Devon Levi to start the third due to an ailment he had sustained in practice.

Samuelsson fell after the whistle and was in some pain. Hard to see what happened with all the players in the way #sabrehood #gohabsgo pic.twitter.com/Eri3cB2dZu " (Tage) was evaluated. It just feels (like) a day-to-day thing.