Morrow left practice early on Tuesday and did not take part in the optional morning skate Wednesday.
His spot at left wing on the third line with Brandon Sutter and Matt Cooke was filled by Tyler Kennedy, who moves up from the fourth line. Kennedy's spot was filled by rookie Beau Bennett, who suited up for the first time since Game 3 of the first round against the New York Islanders, a span of six games.
Bennett scored a goal in his first career playoff game in Game 1 of the first round and went pointless in his next two games.
As expected, Jussi Jokinen dressed for the first time since Game 4 of the first round, centering the Penguins' fourth line with Bennett and Craig Adams. Jokinen had two assists in Game 1 against the Islanders and was held off the score sheet in his next three games.
Tanner Glass was scratched after playing 9:56 in the Penguins' double-overtime loss in Game 3.