Gibson (toe) is listed as questionable for Sunday's game against the Panthers, John Keim of ESPN.com reports.
Gibson was a limited practice participant Wednesday through Friday, with coach Rivera noting Thursday that the running back looked good. Both Gibson and quarterback Alex Smith (toe) appear truly questionable, while wideout Terry McLaurin (ankle) is listed as doubtful. J.D. McKissic earned 24 carries and 14 targets the past two weeks with Gibson inactive, working ahead of Peyton Barber (16 carries, four targets) for the most part.