Mason did not see the field on offense while logging 11 snaps on special teams in Monday's 22-17 loss to the Vikings.
Mason was surprisingly not used on offense even with starter Christian McCaffrey (oblique) playing through a lingering injury suffered in last week's loss to Cleveland. The latter wound up playing 100 percent of San Francisco's offensive snaps Monday, and Elijah Mitchell received the only non-CMC carry for San Francisco's backfield. Mason was coming off a pair of strong performances with a touchdown in each, so Monday's lack of usage killed any momentum the backup was building heading into next Sunday's tilt against the Bengals.