The 49ers have deemed S Jaquiski Tartt (groin) and LB Kwon Alexander (ankle) doubtful for Sunday's game against the Seahawks. That should keep S Marcell Harris and LB Dre Greenlaw in full-time roles and in play for IDP lineups. S Jimmie Ward (quad) is questionable after missing last week's game. If Ward can't go, then Tarvarius Moore would get another start. We'll check his status Sunday.

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Niners S Jaquiski Tartt (groin) and S Jimmie Ward (quad) remained out of practice Wednesday after missing Sunday's win over the Patriots. Tarvarius Moore and Marcell Harris started in their places against New England and tied for the team lead with 5 solo tackles. Each would be in play for IDP use against a pass-heavy Seattle team this week if Tartt and Ward sit again. Moore is the Ward replacement and Harris for Tartt, though their in-game roles have been fairly interchangeable. Elsewhere on the defense, LB Kwon Alexander (high-ankle sprain) remained out of practice Wednesday. His absence would keep Dre Greenlaw in a full-time role.

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Niners DE Nick Bosa, DE Dee Ford and S Jaquiski Tartt are active for today's game against the Steelers. All entered the day questionable and are low-level IDP options at best. Ford, in particular, has been struggling through his return from a preseason knee sprain and should not be in fantasy football lineups. DB Jimmie Ward, meanwhile, is inactive once again. That keeps Tarvarius Moore in play for deep IDP leagues.

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Niners S Jaquiski Tartt re-aggravated his shoulder injury in Sunday's loss to the Seahawks. Tartt has already lost 4 games to injury this season and hasn't reached 90% playing time since Oct. 21. He's not worth hanging on to in most IDP leagues at this point. If Tartt misses further time, Antone Exum would hit the IDP radar. He started in Tartt's place earlier this year and stepped in for the other half of Sunday's SS snaps.

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