We know what's going on with forward Jonathan Drouin, who is obviously not in the team's short-term plans, and he will be left out again tonight.
On the other hand, after the little controversy at the beginning of the week, Martin St-Louis is doing everything he can to include Drouin, and it's not going unnoticed.
"MSL spent a lot of time working on the ice this morning in Detroit with Jonathan Drouin who will obviously be left out again tonight. Not all head coaches deal with scratched players." - Marc Denis, RDS
See the publication in question:
As the RDS analyst mentioned, not all coaches would have done this during a morning practice with a player who does not play at night.