Dunlap's back locked up on the final snap of Wednesday's practice and spasms sidelined him Thursday and Friday. He had already been replacing All-Pro left tackle Jason Peters, who's out with a hamstring injury and missed the Buffalo game.

If the Eagles go with Justice against the Redskins, Todd Herremans will move from right tackle to the left tackle, where he played once in 2009 and four times his rookie year of 2005.