"Strong safety Troy Polamalu and running back Willie Parker could return to action Sunday but the Steelers are expected to be without defensive end Aaron Smith when they host the Browns.

And Steelers coach Mike Tomlin said Smith may be out for an extended period of time because of a shoulder injury he sustained in last Sunday's 28-20 win over the Lions.

"Potentially could be significant," Tomlin said of Smith's injury.

If Smith is unable to play Sunday the Steelers will use a rotation of Travis Kirschke, Ziggy Hood and Nick Eason, Tomlin said."