Either Harris or Kendall Gaskins will likely start Sunday's game against the Lions with Shaun Draughn (knee) ruled out, the San Jose Mercury News reports.
Harris was just added to the 49ers' roster this week, but the team has been hesitant to give Gaskins carries, so Harris could be the primary ball carrier Sunday despite his lack of familiarity with the offense. Gaskins figures to at least see action on passing downs after catching six passes last week, but Harris could provide fantasy value even if serves as the goalline back, with the 49ers facing a Lions defense that has allowed 18 rushing touchdowns -- tied for most in the league.