RB Shaun Draughn, who was injured on Sunday, has also been ruled out with a knee injury. Kendall Gaskins and newly signed DuJuan Harris are the only remaining healthy running backs currently on the roster.
LB Michael Wilhoite will also miss Sunday's game.
San Francisco 49ers
Out: LG Alex Boone (knee), RB Shaun Draughn (knee), OL Marcus Martin (concussion), ILB Michael Wilhoite (ankle)
Probable: DT Arik Armstead (shoulder), ILB NaVorro Bowman (shoulder/finger), CB Tramaine Brock (hamstring), OLB Ahmad Brooks (shoulder/back), DT Quinton Dial (shoulder), OLB Eli Harold (shoulder/hamstring), CB Dontae Johnson (ankle), OLB Aaron Lynch (concussion), RT Erik Pears (knee), WR Torrey Smith (back/foot), LT Joe Staley (knee), SS Jaquiski Tartt (knee)
Detroit Lions
Questionable: CB Dwight Bentley (illness), LB Josh Bynes (foot), WR Calvin Johnson (ankle), DT Haloti Ngata (neck), T Michael Ola (knee), S Glover Quin (concussion), DT Caraun Reid (ankle), G Larry Warford (quadricep)
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