The Ravens’ re-tooled offensive line got a little bit of a scare Friday when starting left guard Ben Grubbs did not practice.

Grubbs was sidelined by what the team has described as a thigh injury, but he is listed as probable for Sunday’s season opener against the Pittsburgh Steelers.

Grubbs’ presence could be key as he is the only offensive lineman who has played at his season-opening starting spot for more than one game in the preseason.

Also, backup inside linebacker Jason Phillips is questionable for Sunday despite overcoming a concussion and fully practicing on Friday.

“He was good today,” Harbaugh said of Phillips after practice. “He banged his nose. He’s got such a great-looking nose anyway. But he’s ok.”

The Steelers have an injury concern in wide receiver Jerricho Cotchery, who did not practice for the second consecutive day. Cotchery, who has been bothered by a hamstring injury, is listed as doubtful.

Pittsburgh ruled out backup linebacker Chris Carter (hamstring), who sat out his third straight practice. But backup offensive tackle Marcus Gilbert (concussion) fully practice for the second consecutive day, and he is probable.