Blackwell (undisclosed) needed to be helped off the ice during Saturday's practice, per Robert Tiffin of NHL.com.
Blackwell had four goals, 15 points, 40 PIM and 112 hits in 70 regular-season appearances in 2025-26. He will likely serve in a bottom-six role when he's healthy this campaign. Joel Kiviranta's chances of dressing for the season opener would increase if Blackwell needs some time to recover.