Coach Mike Shanahan also indicated Monday that Chris Cooley's season might be over after the tight end broke the left index finger in Sunday's 20-13 loss to Philadelphia.
Cooley will have surgery Wednesday. After that, the Redskins will get another opinion on the sore knee that has hampered him all season.
Meanwhile, left tackle Trent Williams is expected to miss at least a couple of weeks with a severely sprained right ankle.
The injuries could lead to different starters at four of the five offensive line positions.
Shanahan said the Redskins will promote rookie guard Maurice Hurt from the practice squad to add depth.
The Redskins are 3-2.