Staal, who had foot tendon surgery six days earlier, was back on the ice after missing two games of the Eastern Conference semifinal series. The Penguins carried a 2-1 lead into Thursday night's game.
Staal, who missed Games 2 and 3, skated for a third straight day during morning practice at Bell Centre. He severed a tendon in his right foot on the skate of Canadiens defenseman P.K. Subban in Pittsburgh's 6-3 win in the series opener.
He returned to the ice Tuesday and skated for about five minutes in a tracksuit before sitting out the Penguins' 2-0 win in Game 3.