Foster took the practice repetitions as the starter all week during practice, according to the source. He is listed as probable.
The Steelers will be without two starting offensive linemen against the Texans, officially ruling out left tackle Jonathan Scott and right guard Doug Legursky on Friday. Trai Essex, who signed with the Steelers during the preseason and has played in all three games, will replace Scott. Ramon Foster will get the start for Legursky.
For a complete look at all injuries around the league, go to NFL.com's injury page.