Rolando McClain availability in question

Tony Romo isn't the only offensive starter expected back to practice on Thursday, but the news on Rolando McClain, the Dallas Cowboys best defender for two games, is somewhat concerning.

Coach Jason Garrett said he anticipates wide receiver Dez Bryant will be able to work after he was limited on Wednesday because of a shoulder injury suffered in last week's win against the Tennessee Titans.

McClain, however, could need more rest because of a groin injury suffered in the Titans' win.

If McClain cannot play Sunday against the St. Louis Rams or is hobbled, the Cowboys would be down their top three middle linebackers with Sean Lee out for the year and Justin Durant recovering from a groin strain. Rookie Anthony Hitchens could be forced to play more Sunday at middle linebacker after working with the first-team at weak-side linebacker last week.

Unlike Romo and Bryant, McClain did not take part in Wednesday's walkthrough.

Running back Joseph Randle (concussion) and defensive tackle Davon Coleman (calf) also did not practice.

Tight end Gavin Escobar was limited with a knee injury. He had a wrap on his knee during the portion of practice open to the media. Defensive tackle Ken Bishop (illness) and defensive end Lavar Edwards (knee) were also limited.

The Cowboys had a bit of good news on the injury front: defensive end Anthony Spencer practiced on a limited basis for the first time this season as he comes back from microfracture surgery on his left knee.