Texans general manager Rick Smith said in a statement Friday that the team is "comfortable" with the health of their 26-year-old running back.
"Our medical team continues to monitor it," Smith said. "He missed one-half of a practice and one-half of a game, and our doctors treated him."
Foster rushed for 1,424 yards and 15 touchdowns in 2012. He was invited to the Pro Bowl for the third time in his three full NFL seasons.
An undrafted free agent in 2009, Foster worked his way up from the Texans' practice squad to become the NFL's leading rusher in 2010 (1,616 yards). Last March, Foster signed a five-year, $43.5 million contract.