Seahawks head coach Pete Carroll said earlier in the week that running back Chris Carson's availability for Thursday night against the Los Angeles Rams would be a game-time decision.
Carroll and the Seahawks have decided Carson will not play on Thursday in the NFC West showdown as the veteran back is inactive.
Carson is dealing with a neck injury that Carroll described on Wednesday as a long-term condition that can flare up.
With Carson not available, the Seahawks are likely to give a bigger workload to Alex Collins in the backfield. DeeJay Dallas could also see more carries.