Sermon (coach's decision) is listed as inactive Sunday against the Cardinals, Matt Maiocco of NBC Sports Bay Area reports.
Starting running back Elijah Mitchell was inhibited in practice this week by a rib injury, and while he's playing, the 49ers reportedly are unsure how much work he'll be able to handle. Despite it all, Sermon won't be a candidate to spell Mitchell, as he's struggled to earn work on offense when the latter has been available to the offense. With Sermon a healthy scratch, Jeff Wilson, JaMycal Hasty and Trenton Cannon are the running backs that will mix in behind Mitchell on Sunday.