Malkin, second on Pittsburgh in scoring with 21 points (seven goals, 14 assists), sustained an upper-body injury in a 2-1 loss to the Chicago Blackhawks on Saturday. He will be re-evaluated Thursday before it's determined if he can play at the Boston Bruins on Friday or against the Tampa Bay Lightning on Saturday, coach Mike Sullivan said.
The Penguins are 4-5-2 in their past 11 games after beginning the season 7-3-1.
Canucks forward Derek Dorsett will not play; he returned to Vancouver on Tuesday for precautionary medical reasons stemming from neck and back stiffness. Dorsett missed 68 games last season after undergoing cervical fusion surgery on Dec. 5, 2016. Vancouver is 2-3-1 in its past six games but is coming off a 5-2 win at the Philadelphia Flyers on Tuesday.