Washington will take over as the Lions' backup running back with Ameer Abdullah (foot) on injured reserve, according to ESPN's Adam Schefter.
Washington played sparingly in the Lions' first two games, but he is set to move up the depth chart with Abdullah out at least the next eight weeks. Theo Riddick will be the Lions' primary running back, but Washington is a bigger back who already found paydirt from one yard out in Week 1, so he could see snaps in short-yardage and goal-line situations.