Dallas also Monday recalled defenceman Aaron Rome from his conditioning assignment with the Texas Stars of the American Hockey League and assigned goaltender Jack Campbell to the AHL squad.
Lehtonen has missed the past five games after being placed on injured reserve retroactive to Oct. 11 when he suffered a lower body injury. In three games this season, he has a 2-1 record with a .953 save percentage and a 1.57 goals-against average.
Campbell made his NHL debut on Sunday night against the Anaheim Ducks, stopping 41 of 47 shots.
This team has been a real treat to say you've been the head coach of them. I'm extremely proud of this group ... after the disappointment of (the Game 6 loss) is digested, it's always a lot easier as a coach when your team has emptied its tank, and that team emptied its tank for me for three months.
— Senators coach Dave Cameron after getting eliminated in the first round by the Canadiens