Sermon (coach's decision) is inactive for Sunday's game against the Lions, Jennifer Lee Chan of NBC Sports Bay Area reports.
After the 49ers invested a third-round selection into him during this year's draft, Sermon not only looked on track to be a regular member of the team's weekly backfield mix, but perhaps a threat to displace Raheem Mostert as the No. 1 option. Even after a strong preseason, however, Sermon will surprisingly find himself in street clothes for Week 1. Behind Mostert, the 49ers will have JaMycal Hasty and Elijah Mitchell active in reserve.