Penguins defensemen Kris Letang and Zbynek Michalek have been diagnosed with concussions, coach Dan Bylsma said this morning.
They will miss tonight's home game against Boston and, under NHL protocol and standard sports medicine, will remain out of the lineup until they are symptom-free and cleared by doctors.
In addition, defenseman Deryk Engelland, who left Saturday's win at Carolina because of an unspecified injury, is day-to-day. Forward Richard Park is considered a game-time decision to play. If he doesn't play, Joe Vitale is expected to take his place in the lineup.
None of those four players participated in the Penguins' morning skate. Letang and Michalek have missed the past three games.
The Penguins have recalled defenseman Alexander Picard from Wilkes-Barre/Scranton of the American Hockey League.
Picard, 26, has played in seven games this season. This is his third recall.
Penguins center Jordan Staal, who was cut when he got hit in the face by a puck Saturday, participated in the game-day skate but added a visor to his helmet. He is expected to play tonight.
Shelly Anderson: email@example.com or 412-263-1721. On Twitter: @pgshelly.