Last year's leading rusher did not get off to an ideal start in training camp. Texans RB Arian Foster left Friday's practice with an apparent left hamstring injury, the Houston Chronicle reported.
Foster did not talk to reporters after practice, which was his first of training camp.
"I don't know, but he didn't feel good, so I just said 'get out,' " head coach Gary Kubiak told the Chronicle when asked about the severity of the injury.
"Knee injuries are frightening. Hamstring injuries are part of the business," Foster said on Saturday. He rushed for 1,616 yards and 16 touchdowns last season.