"You know, he’s doing OK," Texans coach Bill O'Brien said. "It’s kind of a day-to-day thing. It’s nothing serious. I would assume, guess you can’t assume anything, but I would assume he would be back pretty soon."
Foster played in eight games last season, then went on injured reserve and had back surgery. He also suffered calf and hamstring injuries during the offseason, which might have been related to his back issue. Foster turns 28 in August and has had more than 1,000 carries in the past three and a half seasons.
Receiver Andre Johnson also missed Friday's practice. Johnson has not practiced since Monday when he injured his right hamstring while making a diving catch.
"I think he’s doing better," O'Brien said. "I think that is something he and I talk about every day. I don’t think there is a need to rush him back. I think he needs to come back when he feels ready to be back. Again, that is not a serious injury, but it is not something that you need to rush him back."