Jackson is still recovering from hurting his left hamstring in Week 1, Riley missed last week's game with a strained left calf, and Hall hurt a toe on his right foot last week.
Redskins coach Jay Gruden says Friday that cornerback Chris Culliver is questionable with a sore knee. If starting cornerbacks Hall and Culliver both are missing, the Redskins would probably go with Bashaud Breeland and Will Blackmon, who was signed last month as a free agent.
Gruden says about Culliver's injury: ''I don't know if it's wear-and-tear or what it is.''
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