Mostert did not play any offensive snaps in Sunday's 16-13 win over the Rams.
Javorius Allen took all of the snaps after Justin Forsett (arm) suffered a season-ending injury, leaving Mostert with nothing more than his usual role on special teams. The speedy undrafted rookie did return two kickoffs for 58 yards, after ripping off a 50-yarder in the previous game. Mostert may be the top backup for passing downs, but there's a good chance Terrance West -- who was a healthy scratch Sunday -- will be next in line for early-down work behind Allen. Mostert's speed at least hints at a shred of upside, whereas West will have a pretty limited ceiling even if he finds his way to significant carries. In all likelihood, Allen will dominate the snaps in Sunday's game against the Browns.