Dahlin was a game-time decision after he didn't return for the third period of Saturday's contest against the Ottawa Senators due to an undisclosed injury.
The first overall pick in June's draft has gotten off to a strong start to his NHL career with a goal and five points in his first 14 games.
The incident occurred during the second period of Friday's game as part of the NHL Global Series in Finland, and saw Lemieux receive a match penalty on the play.
The 18-year-old blocked a shot in the second period and did not return for the third, according to Sportsnet's John Shannon.
The injury is not believed to be serious and head coach Phil Housley noted postgame that Dahlin will travel with the team to New York for its game against the Rangers on Sunday, but there has been no diagnosis yet, according to Mike Harrington of The Buffalo News.
Dahlin, the first overall pick in June's draft, picked up an assist Saturday before exiting, giving him five points in 14 games this season.
The Ottawa Senators have sent rookie forward Alex Formenton back to his junior club, the London Knights of the Ontario Hockey League, general manager Pierre Dorion told TSN 1200 following Thursday night's game.
The 19-year-old played in nine of the Senators' opening 12 games, where he recorded just one goal on 16 shots. By returning Formenton down prior to him playing in his 10th game of the season, the team won't burn the first year of his entry-level contract.
Formenton was drafted in the second round, 47th overall, in 2017. Last season, he recorded 29 goals and 48 points in as many games with the Knights.
Scoring is up across the league to begin the year, but that doesn't mean goaltenders haven't been posting monster numbers. Here are the early front-runners for the Vezina Trophy after the first month of the 2018-19 NHL season.
5. Jaroslav Halak, Boston Bruins
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He's not the Bruins goalie you might expect to make this list, but through six games this season Jaroslav Halak is playing incredibly well.
The veteran netminder was brought in to be Tuukka Rask's backup, and now he's stolen starts while going 4-0-2 with a .947 save percentage and a 1.51 goals-against average, putting him second and first in those categories, respectively, among goalies who have appeared in at least five games this season.
If he can maintain that level of play, which has also included two shutouts, Bruins head coach Bruce Cassidy will face a very difficult decision.
4. Andrei Vasilevskiy, Tampa Bay Lightning
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Andrei Vasilevskiy has been nearly perfect to begin the season, posting a 6-1-1 record through eight games.
Following a 2017-18 campaign that ended with Vasilevskiy receiving his first career Vezina Trophy nomination, it appears the 24-year-old could once again contend for the award. He's posted a 1.98 goals-against average and a .935 save percentage, marks that rank third and sixth league-wide.
The Lightning's offense is beginning to hit its stride, which will make Vasilevskiy's job easier. He could hit the 40-win plateau for the second straight year.
3. Devan Dubnyk, Minnesota Wild
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The Wild sit just two points outside of the top spot in the Central Division, even though the club is averaging the ninth-fewest goals per game.
Devan Dubnyk has been a rock between the pipes and is driving the team's success. The 32-year-old has recorded a goals-against average of 2.19 and a .937 save percentage. He's given up two or fewer goals in six of his nine games played. Even more impressively, Dubnyk has also faced the third-most shots in the league.
If he keeps this up, Minnesota should earn its seventh straight postseason berth.
2. John Gibson, Anaheim Ducks
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No goalie has faced more rubber than John Gibson, with an average of 38.4 shots per game directed his way. He appears to be the sole reason for the Ducks still being within reach of the Pacific Division lead.
Opposing teams are outshooting Anaheim by roughly 14 shots per game this season, but the Ducks are still just three points back of the division-leading San Jose Sharks. Gibson's 9.38 goals saved above average leads the league, and he's also produced a league-leading 84 high-danger saves, which is 26 more than the next-closest goalie.
Few players have been more valuable to their team than Gibson. He could be in the running for the Hart Trophy if he can drag the Ducks into the playoffs.
1. Semyon Varlamov, Colorado Avalanche
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Semyon Varlamov has faced 262 shots over his first eight games of the season, and just 13 pucks have gone past him.
He's the league's save-percentage leader with a mark of .950, and Varlamov ranks fifth in 5-on-5 high-danger save percentage. His stellar play is helping the Avalanche challenge for the top spot in the crowded Central Division.
Colorado brought in former Washington Capitals backup Philipp Grubauer this offseason, with the hope he would challenge for the starting role. But after Varlamov's scorching start, it appears the net is his until further notice.
The St. Louis Blues let another one get away from them Thursday night.
After taking an early 2-0 lead against the Columbus Blue Jackets, the club surrendered four straight goals en route to a 7-4 drubbing. It marked the second straight game in which the Blues coughed up a two-goal lead after doing so against the Winnipeg Jets on Monday.
Thursday's loss sees the team now just two points out from last place in the Central Division. The Blues entered this season with high expectations following an impressive offseason, which is why head coach Mike Yeo admits his job should be on the line after their rough start.
"Heck, my job should be in question right now," Yeo said, according to The Athletic's Jeremy Rutherford. "Of course that comes with the trade. But I'm not going to coach to try to save my job. I'm going to coach to try to win the Stanley Cup. I believe in this group, so whatever we need every single day, I'm going to try to do that."
Luckily for Yeo his players appear to have his back.
"There is no question, anyone thinking he (does) not deserve to be here, we support him," Vladimir Tarasenkosaid of Yeo. "We believe in him, that's why he's our coach right now, and we will (fu-----) play for him so hard. So there's no question about (whether the) team doesn't believe in the coach."
Tarasenko: "It feels like shit to be doing this in front of our fans." #stlblues
To the Blues' credit, they've scored the third-most goals in their division this season, but they've also given up the most in the Central Division and the third-most league-wide.
As for Yeo, his job appears to be safe, at least for the night.
For whatever it’s worth, Armstrong was leaving the building before Yeo addressed the media. So this doesn’t appear to be a late night involving the Blues’ brass. #stlblues
Boeser also missed practice on Tuesday. He's been battling the ailment since last Thursday's game against the Winnipeg Jets, head coach Travis Green told reporters on Tuesday, according to Patrick Johnston of The Province.
The 21-year-old is off to a slow start after a sizzling rookie campaign. He's scored just two goals and recorded six points during the Canucks' first nine games of the season.
Borowiecki elbowed Vaakanainen, who was playing in just his second career game, on Tuesday during a scrum in front of the Senators' net, and he wasn't given a penalty.
