Running back Arian Foster will be a game-time decision for Houston's game against Miami on Sunday.
Coach Gary Kubiak said Friday that he's optimistic Foster will play after the running back left Thursday's practice with what was called a minor knee injury, but it will be a game-time decision.
The Texans a nearly two-touchdown favorite at home and with backup Ben Tate a strong runner in his own right, Kubiak may choose to give Foster a week off.
"I work extremely hard, and sometimes things just need a little bit of rest," Foster told the team's website.
The former undrafted free agent signed a five-year, $43.5 contract in March. He has 2,857 rushing yards in the past two seasons, including 1,224 yards and 10 touchdowns in 14 games in 2011. He spent most of the 2009 season on the practice squad before breaking in the lineup with 216 rushing yards and three touchdowns in the final two games.