Can one assume that Pogba would have shared those sentiments with the manager prior to the game, and that he was selected in the full knowledge that he felt under no obligation to take the game seriously? I don't think so. If that really was his attitude, and he felt that it was an acceptable one, then the club is in more trouble than I care to imagine. It's not down to Pogba, or any other player, to decide which games to try in, and which games to coast in (he, like every other player, should always try when selected and never coast).
I seem to remember Paul Scholes throwing his toys out of the pram about being selected in a similar sort of tie, and discovering in pretty short order just who was in charge. Maybe it's time for Ole to start getting tough with anyone who thinks it's acceptable to be a prima donna.
As it happens, I doubt the shortcomings in Pogba's performance were the result of a lack of effort, but just a result of not having played recently