Expected to miss eight weeks
Mostert (knee) is expected to miss about eight weeks and will go on IR, Nick Wagoner of ESPN.com reports.
Mostert exited Sunday's win over the Lions with a knee injury, which turns out to be chipped cartilage. Rookie sixth-round pick Elijah Mitchell took over for Mostert against Detroit and rushed for over 100 yards, so he'll likely lead San Francisco's backfield in Mostert's absence. JaMycal Hasty and rookie third-round pick Trey Sermon should also see additional opportunities while Mostert recovers.
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Sermon (concussion) practiced in a limited capacity Thursday, Jennifer Lee Chan of NBC Sports Bay Area reports.
Mitchell (shoulder) didn't practice Thursday, Jennifer Lee Chan of NBC Sports Bay Area reports.
Mitchell (shoulder) wasn't present at the start of Thursday's practice, Matt Barrows of The Athletic reports.
Sermon (concussion) was a limited practice participant Wednesday, Matt Barrows of The Athletic reports.
Sermon (concussion) is in line to practice on a limited basis Wednesday, Cam Inman of The San Jose Mercury News reports.
Mitchell (shoulder) won't take part in practice Wednesday, Cam Inman of The San Jose Mercury News reports.
Thompson signed with the 49ers' practice squad Wednesday, Matt Maiocco of NBC Sports Bay Area reports.
Patrick will be signed by the 49ers on Tuesday off the Bengals' practice squad, Tom Pelissero of NFL Network reports.
Cannon could see his role expand with all three running backs ahead of him on the depth chart dealing with injuries.
Sanu failed to haul in his lone target in Sunday's 17-11 win over the Eagles.