The San Francisco 49ers have lost Raheem Mostert for about eight weeks because of \"chipped cartilage\" in his knee. The injury requires arthroscopic surgery and lands Mostert on injured reserve.
Elijah Mitchell had 19 carries for 104 yards for the 49ers while JaMycal Hasty had a touchdown.
Trey Sermon was inactive after spending most of the preseason backing up Mostert.