They likely won't get much sympathy from the Flames, who continue to play without the injured Miikka Kiprusoff.
Seeking a sixth win in seven games, Dallas opens a three-game homestand Sunday looking to avenge its disappointing effort versus Calgary.
The Stars (8-6-1) pulled out a 4-3 victory at Vancouver on Friday as Antoine Roussel tied the game 12:22 into the third period and Brenden Dillon scored the game-winner with just over three minutes to go. Michael Ryder also came up big with two assists for Dallas, which improved to 5-1-0 since Feb. 4.
"We're going to be a team that has to do it collectively and we need contributions from everybody," coach Glen Gulutzan said. "We got them and that's what is going to have to happen to us moving forward."
Unfortunately for Dallas, Friday's win may have come at a cost. Lehtonen, who entered the weekend with a 1.77 goals-against average during a five-start winning streak, stopped all seven shots he faced against the Canucks before leaving with a lower-body injury in the first period.
If Lehtonen, listed as day-to-day, can't play against Calgary (4-5-3), the Stars could go with Richard Bachman, who came on to make 18 saves Friday. Bachman has compiled a 4.03 GAA in dropping both his starts this season, including Wednesday's 7-4 road loss to the Flames. The third-year goaltender allowed a career worst-tying six goals in that contest.
"I've said this again and again, he's a mentally strong guy," Gulutzan said. "He came off a game in Calgary that he wasn't happy with, but he came in in relief here, made some big saves and then at the end, you could see he was getting more and more confident, and that's a big step for him."
The Stars are 10-2-4 in their last 16 home matchups against the Flames, who've posted mixed results since losing Kiprusoff to a sprained knee ligament Feb. 5. The Finland native is expected to miss at least another week.
Calgary won its first game without Kiprusoff but has since gone 1-2-1 while allowing an average of 3.8 goals. Two days after beating Dallas, the Flames saw their woes resume Friday in a 5-2 loss to St. Louis.
Leland Irving allowed two goals on four shots before being replaced in favor of Joey MacDonald just over four minutes into the game. MacDonald was handed the loss after stopping 18 of 21 shots in his team debut.
A day later, the Flames assigned Irving to their Abbotsford affiliate and recalled goaltender Danny Taylor from the AHL.
"When we claimed Joey MacDonald off waivers we did so with the expectation that he would play games for us," Flames general manager Jay Feaster said in a statement. "Now that he has seen some game action we intend to use him more."
Curtis Glencross scored his team-leading sixth goal and Dennis Wideman added his third, but the Flames never really had a chance after entering the second period down 4-0.
"We dug ourselves a really big hole against a very good hockey team," Wideman said. "Anytime you spot a team like that four goals in the first, it's not going to be too many times you're going to be able to come back."
Michael Cammalleri, who recorded a hat trick to go along with an assist versus Dallas on Wednesday, has seven goals and 12 points in his last seven matchups against the Stars.
Calgary has gone 4-1-0 when scoring at least four goals compared to 0-4-3 when recording three or fewer.