Neither player took part in Tuesday morning's optional skate after both missed significant parts of Saturday night's 2-1 double-overtime loss in Boston. The Bruins lead the series 3-2.
Wisniewski left Game 5 for an undisclosed reason but returned in overtime and finished the game. Desharnais suffered an apparent knee injury in overtime.
Montreal coach Jacques Martin had no update on either player's condition and said both would be game-time decisions.