His status stems from doubts about his hamstring, and he has been limited in practice throughout the week, wrote Sidhu.
A veteran in his sixth year, the 28-year-old Foster has rushed for 103 and 138 yards the first two games this season, helping lead the Texans to an undefeated record. Houston currently leads the AFC South.
Injury ended Foster's 2013 season early, and the running back underwent back surgery last November. In the three years before his shortened 2013 season, Foster ran for more than 1,200 yards and double-digit touchdowns each year.