Trossard was dogshit.
Since the Strop (what is the code for 'tm' these days? It's ruining my posting, lol) he has been fucking awful when he's started games. Best example of an impact sub we've had in years.
He's not a striker but he should know the basics of football by now - like when to run into the box instead of standing in the midfield, how to receive a basic pass, how to pass the ball out quickly to evade danger, etc