Marks (ankle) wasn't spotted at practice Thursday, Jonathan M. Alexander of the Houston Chronicle reports.
Marks hasn't practiced in any fashion since exiting this past Sunday's 40-20 win over the Cardinals due to an ankle injury, so at least for the time being, his availability for this weekend's game against the Raiders is in question. If Marks ends up sitting out the Week 16 game or is available only for limited snaps, Nick Chubb (ribs)-- if available -- and Jawhar Jordan would be in line to see added snaps and touches out of the backfield.