Harris had 11 carries for 39 yards and caught both of his targets for 18 yards in Sunday's 34-17 loss to Tampa Bay.
Harris led the 49ers' backfield in touches, although Mike Davis scored a short touchdown and Shaun Draughn also scored, while leading the team with five receptions on seven targets for 37 yards. Harris, who was just promoted to San Francisco's active roster, will have a role until Carlos Hyde (shoulder) returns from injury. Considering the 49ers are on bye next week, Hyde's return could be in Week 9.