Coach Mike Shanahan said Thursday that Landry will miss his second consecutive game with a left Achilles tendon injury. Torain is missing his third game in a row with an ailing hamstring.
The Redskins officially placed running back Clinton Portis on injured reserve because of a torn muscle in his lower abdomen.
Portis returned from a groin injury Sunday against Tennessee, but lasted only five carries before getting hurt again. He will have surgery and require at least two months of rehabilitation, ending his season with a career-low 227 yards on 54 carries with two touchdowns.
Shanahan rearranged the schedule Thursday, holding an early practice so players could get home and celebrate Thanksgiving.
Information from The Associated Press contributed to this report.