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.
For six months, it's a really good accomplishment. But as soon as April [11, the end of the regular season] comes around, no one thinks about the regular season anymore. For six months, it's a real battle to get into the playoffs in the NHL these days. There are a lot of good teams, and it takes consistency over a long time.
— Ducks coach Bruce Boudreau on clinching a playoff berth after a win against the Islanders on Saturday