Gallagher did no participate in the morning skate because of the flu. If he can't go expect George Parros to slide into the lineup and Rene Bourque or Max Pacioretty to move up alongside Lars Eller and Alex Galchenyuk. Consider Gallagher as a game-time decision.
Schenn sat out the Flyers last game because of the flu but he will be back in the lineup tonight when the Flyers take on the Devils. Schenn is a solid defensive defenseman, so he is a much more useful hockey player than he is fantasy player.
Once Gallagher gets cleared for contact it won't be long before he is back in the Canadiens lineup. The Habs are first in the East right now and will only get better with the return on Gallagher who has 8 points and is a +7 in 13 games this season.
This is a tough break for Gallagher who has had a great start to his NHL career. He has 5 G and 3 A with a +7 in his first 13 games. Concussion's are tricky so there is no timetable for his return.