Texans RB Foster still day-to-day

Houston Texans running back Arian Foster did not practice on Wednesday, four days before the club opens its regular season against the Indianapolis Colts.

Foster made headlines last week when he linked a picture of an MRI of his injured left hamstring to his Twitter account.

Texans head coach Gary Kubiak did not give a firm indication if Foster would be ready for Sunday, instead saying he was "day-to-day."

"He went a little harder today in his rehab process," Kubiak said of his workhorse back. "We'll see where we're at [Thursday], but it looked like he did a little bit more from me watching from afar."

Foster, who had arthroscopic surgery on his right knee in the offseason, burst onto the scene in 2010 -- his second year in the league -- and totaled 2,220 yards from scrimmage, including a league-leading 1,616 rushing yards, to go with 18 touchdowns.

He re-signed with Houston in July before aggravating his hamstring during the preseason.