Player Bio
| HT/WT: 6-6, 221 lbs |
| Birthplace: Hamilton, ON |
| Age: 23 |
| Experience: 1 |
| Shoots: Left |
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0:44Highlights: Mammoth at Golden Knights (11/11)
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1:40John Tortorella's Success With Golden Knights
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2:05Highlights: Howden's Short-handed Goal Wins it for Vegas
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1:00Who Feels The Physical Toll Of The Mammoth-Golden Knights Series First?
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1:17Golden Knights Gutsy Game 4 Win Evens Series 2-2
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1:37Breaking Down the Golden Knights' 2026 Playoff Path
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0:57Mammoth Win 1st Playoff Game, Chance To Win Series
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1:05NHL Stanley Cup Playoffs Betting Preview: Mammoth at Golden Knights
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0:20Highlights: Kings at Mammoth (12/8)
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2026 Goaltending
| STATS |
W
Wins
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L
Losses
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OTL
Overtime Loss
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GAA
Goals Against Average
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SV%
Saves Percentage
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SO
Shutout
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|---|---|---|---|---|---|---|
| Regular Season | 4 | 2 | 1 | 3.56 | .863 | 0 |
Top Sebastian Cossa News
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Mammoth's Sebastian Cossa: Yields five goals in loss
Cossa stopped 23 of 28 shots in Wednesday's 5-3 loss to the Golden Knights.
Cossa didn't get much help from a depleted Mammoth lineup, which mustered just 17 shots against Carter Hart. The 23-year-old Cossa has seen his playing time rise recently, but he's now allowed five goals in consecutive contests, which could land him back in the backup role soon. He's at a 4-2-1 record with a 3.56 GAA and an .863 save percentage over eight games (seven starts). Expect Karel Vejmelka to get the nod Thursday at home versus the Blues to wrap up the back-to-back set.
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Mammoth's Sebastian Cossa: Guarding goal in Vegas
Cossa will protect the road goal versus the Golden Knights on Wednesday, Danny Webster of the Las Vegas Review-Journal reports.
Cossa will start for the third time in four games. He's getting a chance at more playing time because Karel Vejmelka has lost three straight outings. Cossa is 2-0-1 with 10 goals allowed on 97 shots over his three games in that span, but with the Mammoth's injury-depleted lineup, he could have a tough outing Wednesday. Expect Vejmelka to get the nod Thursday versus the Blues.
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Mammoth's Sebastian Cossa: Falls to Habs in OT
Cossa turned aside 30 shots in Thursday's 5-4 overtime loss to Montreal.
The Mammoth got out-shot 35-20 on the night, but Cossa nearly did enough to steal a road win for his squad. Adam Engstrom snuck a shot through traffic late in the third period to tie it up, however, before Cole Caufield ripped home the winner just 30 seconds into OT. Cossa still avoided taking a regulation loss for a fourth straight start, posting a 3-0-1 record since Oct. 19 despite a lackluster 3.45 GAA and .879 save percentage. The 23-year-old netminder is still showing some growing pains in his first full NHL campaign, but he appears to be settling in as Karel Vejmelka's backup.
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Mammoth's Sebastian Cossa: Facing Habs Thursday
Cossa will patrol the road paint in Thursday's clash against the Canadiens, per Renaud Lavoie of TVA Sports.
For the second time this season, Cossa will appear in his second consecutive game. The 23-year-old netminder has brought the Mammoth success recently, as he's currently riding a three-game win streak. Overall, he has a 4-1-0 record, a 2.95 GAA and an .875 save percentage across six appearances. With Karel Vejmelka struggling to begin the 2026-27 campaign, the door is open for Cossa to turn Utah's crease into a true timeshare. He'll face a tough test Thursday, as the Canadiens are getting Nick Suzuki and Kirby Dach back in their lineup. Given Cossa's recent success, however, he's a decent spot start in deep fantasy leagues.
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Mammoth's Sebastian Cossa: Third straight win
Cossa made 27 saves in a 3-2 victory over the Maple Leafs on Tuesday.
The big netminder is on a roll. Cossa has won three consecutive starts and twice in the last two weeks (2-0-0; five goals allowed). That's material because starter Karel Vejmelka is 0-2-0 with eight goals allowed in that same span. There's no netminding controversy yet, per se, but the Mammoth could alternate goalies short term if Vejmelka can't settle his game and Cossa continues to step up.
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Mammoth's Sebastian Cossa: Facing Maple Leafs
Cossa will patrol the road crease in Tuesday's clash against the Maple Leafs, per Mark Masters of TSN.
Cossa picked up his second consecutive win in Thursday's clash, as he anchored the Mammoth to an overtime victory against the Penguins. Overall, the 23-year-old backstop has a 3-1-0 record, a 3.20 GAA and an .855 save percentage across five appearances. While he's been inconsistent despite earning a win in the majority of his appearances thus far, Cossa remains a solid stash in deep dynasty leagues given his potential to earn a true timeshare in Utah's crease. He'll face off against the Maple Leafs on Tuesday, who rank 4th in the NHL with 3.75 goals per game this season.
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Mammoth's Sebastian Cossa: Carried to OT win by offense
Cossa turned aside 31 shots in Thursday's 4-3 overtime win over the Penguins.
Cossa nearly blew an early 2-0 lead, but Logan Cooley bailed him out by completing a hat trick with exactly one second left on the clock in the third period, batting a puck out of midair past Arturs Silovs. That set the stage for Mikhail Sergachev to flip home the OT winner. Cossa continues to benefit from plenty of offense when he's between the pipes -- despite a lackluster 3.20 GAA and .857 save percentage in five outings (four starts), the 23-year-old netminder sports a 3-1-0 record as Karel Vejmelka's backup.
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Mammoth's Sebastian Cossa: Set to start Thursday
Cossa will protect the road goal versus the Penguins on Thursday, Josh Getzoff of SportsNet Pittsburgh reports.
Cossa will get another look at the Penguins after earning the win by stopping 15 of 19 shots against them Oct. 19 in Utah. Cossa's start also allows Karel Vejmelka to get some rest after he started the last three games. Cossa has a 3.33 GAA and an .820 save percentage over four outings this season, which makes him a risky fantasy option.
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Mammoth's Sebastian Cossa: Earns win despite allowing four goals
Cossa stopped 14 of 18 shots in Monday's 5-4 win over the Penguins.
Cossa secured the victory despite posting a disappointing .778 save percentage, and it was clear that he benefited from Utah's impressive offensive performance. The young netminder faced relatively little pressure for much of the contest but conceded twice in the third period as Pittsburgh threatened a comeback. Although the win provides some fantasy value, his limited save total and four goals allowed highlight the volatility of his early NHL opportunities. With Karel Vejmelka being a workhorse in the Mammoth's crease, Cossa's fantasy upside will be limited to specific matchups in which he gets an odd start. He's not a goaltender you'd be looking to roster in most formats, especially since he's posted a single-game save percentage below .800 in three of his four appearances.
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Mammoth's Sebastian Cossa: First goalie off Monday
Cossa was the first goalie off during Monday's morning skate, Cole Bagley of KSL Sports reports, indicating that he'll draw the home start against the Penguins.
Cossa has seen limited playing time early in the regular season, but he entered Saturday's home game against the Oilers in relief and turned aside three of four shots he faced. He'll draw his third start of the season Monday, and he's gone 1-1-0 with a 2.94 GAA and .839 save percentage across his three appearances to begin the year.
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Mammoth's Sebastian Cossa: Limited work in relief outing
Cossa stopped three of four shots in relief of Karel Vejmelka during Saturday's 6-2 loss to the Oilers.
Cossa handled a little less than half of the game and faced little traffic. Through three outings this season, he's given up five goals on 31 shots. Cossa will continue to handle the backup role behind Vejmelka, which will likely see the former on the bench to begin Monday's game versus the Penguins.
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Mammoth's Sebastian Cossa: Chased after three goals on eight shots
Cossa allowed three goals on eight shots before being replaced in the first period of a 6-1 loss to Boston on Thursday.
Boston rang up those three goals in a 5:45 span, culminating with Mason Lohrei's quick snipe stick side at 15:51. He had delivered an outstanding performance against Columbus in a win Saturday night, but Boston plays an entirely different level. Cossa will get another chance soon, but his matchup will matter. This was his third NHL start of his career, so his development will take priority. Cossa may get 20-25 starts this season.
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Mammoth's Sebastian Cossa: Patrolling road crease
Cossa will get the road start in Thursday's clash against the Bruins, per Cole Bagley of KSL Sports.
Cossa will look to continue his strong start with Utah after he anchored the Mammoth to a 4-1 win Saturday in his team debut. The 23-year-old netminder stopped 18 of 19 shots on net in the outing, and he projects to be a high-upside No. 2 option behind Karel Vejmelka this season. Cossa will face a relatively tough test on Thursday, however, as the Bruins have posted three goals or more in two of their first contests to open the new season. He is a solid streaming option in deep fantasy leagues for Thursday's matchup.
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Mammoth's Sebastian Cossa: Gets win in Utah debut
Cossa stopped 17 shots in Saturday's 4-1 win over the Blue Jackets.
A Kent Johnson tally in the second period spoiled a shutout bid for Cossa in his Mammoth debut, and just his second NHL appearance. The 23-year-old netminder is set to back up Karel Vejmelka this season after being acquired from the Red Wings in June, and more performances like this could earn him a bigger share of the workload than expected.
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Mammoth's Sebastian Cossa: Expected to start Saturday
Cossa is slated to start on the road against Columbus on Saturday, per Catherine Bogart of the Mammoth's official site.
Karel Vejmelka started in Utah's season opener, posting a 15-save shutout over Chicago. Vejmelka is poised to get the bulk of the Mammoth's work this campaign, which leaves Cossa firmly in the No. 2 spot.
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Mammoth's Sebastian Cossa: Falls in overtime
Cossa stopped 30 of 35 shots in Thursday's 5-4 preseason overtime loss to the Golden Knights.
Cossa looked good at times through the first two periods, but he couldn't hold back Vegas in the third. The 23-year-old will get a chance to be an NHL regular as Karel Vejmelka's backup in 2026-27. Cossa has allowed six goals on 47 shots over two preseason outings, though it'll likely be Vejmelka between the pipes for the preseason finale Saturday versus the Avalanche.
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Mammoth's Sebastian Cossa: Expected to start Thursday
Cossa is slated to start in Thursday's preseason road game against Vegas, per Jesse Granger of The Athletic.
Cossa had a 2.33 GAA and a .915 save percentage in 39 regular-season appearances in 2025-26. This will be his second game of the 2026 preseason after he turned aside 11 of 12 shots across 40 minutes manning the net during Sunday's 4-1 loss to Colorado.
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Mammoth's Sebastian Cossa: Makes 11 saves in exhibition play
Cossa allowed one goal on 12 shots in Sunday's 4-1 preseason loss in Colorado.
Cossa played the first 40 minutes of Sunday's game before being replaced by Michael Hrabal in the final stanza. Utah gave up a first-round pick to get Cossa on the night of the 2026 NHL Draft, so he will likely be given every opportunity to earn the backup role behind Karel Vejmelka this season.
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Mammoth's Sebastian Cossa: Guarding goal Sunday
Cossa will defend the road net in Sunday's preseason matchup against Colorado, Brogan Houston of the Deseret News reports.
Cossa posted a 26-8-4 record with a 2.33 GAA and a .915 save percentage in 39 regular-season games for AHL Grand Rapids in 2025-26. He is competing for Utah's backup role behind Karel Vejmelka during training camp.
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