Sermon isn't in line to play in Sunday's preseason contest at the Chargers, Nick Wagoner of ESPN.com reports.
Sermon will join starting running back Raheem Mostert and fellow rookie Elijah Mitchell (hip) on the sideline. With the trio unavailable, San Francisco's backfield has been whittled down to Wayne Gallman, JaMycal Hasty, Kyle Juszczyk and Josh Hokit for preseason Week 2.