"The night before, or 90 minutes before," head coach Bill O'Bien said, when asked how Foster was doing.
The 2010 NFL rushing king injured his groin on August 3, and returned to practice two weeks ago. He was with the team on a limited basis.
In 2014, Foster gained 1,246 yards on the ground in 13 games.
O'Brien said Foster practiced again on Wednesday at the Houston Methodist Training Center with the Texans.