After absorbing a hit from Toronto forward James van Riemsdyk in the final period, Malkin took one shift before sitting out the rest of the period and the five-minute overtime. He did not take part in the shootout.
"He wasn't sitting out because of his play," coach Dan Bylsma said. "Just an upper-body injury. Just kept him out the rest of the game there and overtime and shootout."
Asked if there was a prognosis, Bylsma replied, "Don't have one (right now). He'll certainly be re-evaluated. In the game, it was more precautionary than anything at that point in time."
Before he was injured, Malkin assisted on Paul Martin's first-period goal, giving him 24 points in 21 games.
Malkin missed four games with a concussion from Feb. 22-March 3. He was injured then after crashing into the end boards in a game against the Florida Panthers.