Both players were questionable this week after Foster missed last week's game with a hamstring injury and Lechler injured his hip in Sunday's loss to the Giants.
Inactive for Houston is cornerback A.J. Bouye, who is dealing with a groin injury. He has appeared in each game for Houston, with one start, and has 14 tackles this season.
As expected, Buffalo backup receiver and special teams player Marcus Easley is inactive because of an injured left leg.