Bruins' Casey Mittelstadt out week-to-week

Boston Bruins center Casey Mittelstadt is nursing an apparent knee issue and has already missed one game, but head coach Marco Sturm said Monday morning he’s been downgraded to week-to-week (via Steve Conroy of The Boston Herald). They’re hoping he can get some light skates in later this week, but he’ll need something of a lengthy ramp-up period before he’s ready for game action again.

Mittelstadt, who turns 27 later this month, was acquired from the Avalanche last season and has had pedestrian output in a middle-six role since. He’s made 33 appearances since the surprise deadline deal, posting an 8-7–15 line with a -17 rating. In 2025-26, he’s already been a healthy scratch once and has seen his ice time drop to 14:32 per game. It’s his first time below 15 minutes since the 2019-20 campaign.

The eighth overall pick of the 2017 draft, Mittelstadt is now with his third club. The 6-foot-1 pivot spent parts of seven seasons with the Sabres before being included in a pair of notable change-of-scenery moves – first to the Avalanche for Bowen Byram at the 2024 deadline and again to the Bruins for Charlie Coyle last year. He flashed legitimate second-line ceiling with Buffalo, rattling off back-to-back 50-point seasons in his final two seasons there, but his offensive production since hasn’t warranted that type of deployment.

In fact, Boston has shifted Mittelstadt to the wing. That’s where the good news lies: he’s spent most of the year as a wingman for Viktor Arvidsson and Pavel Zacha, and that trio has churned out the best two-way play of the B’s’ frequently-used line combos. Of their three to log 50 minutes together, the Arvidsson-Zacha-Mittelstadt unit’s 50.0 xGF% is the best, per MoneyPuck. He’s got an even rating for the year as a result.

The Bruins now find themselves down two top-six pieces long-term in Mittelstadt and Elias Lindholm, who’s out week-to-week with a lower-body issue. The team has performed better than expected offensively this year, ranking 12th in the league with 3.29 goals per game, but that figure is down to regress thanks to those absences and a 12.2% shooting rate that’s bound to cool off.

Call-up Alex Steeves found himself in Mittelstadt’s slot on the second line when he made his Boston debut against his former team, the Maple Leafs, on Saturday. He didn’t record a point but could get a second look there in Boston’s rematch with Toronto Tuesday.