CHARLOTTE – The Panthers haven't ruled out the possibility of center Ryan Kalil playing against the Los Angeles Rams on Sunday despite not practicing this week.

Kalil, who injured his shoulder in last week's over the Arizona Cardinals, is listed as questionable. The All-Pro center did some work on the side Friday, which was a positive sign.

"It went well, so we'll see how he is tomorrow," head coach Ron Rivera said. "It was pretty encouraging today to see Ryan striking the pads and all that stuff."

Linebacker Luke Kuechly and defensive end Mario Addison missed practice with groin injuries for the second consecutive day and both are listed questionable, but Rivera expects them to play.

"(Luke) did what he needed to do, so we shut him down, as we did with Mario," Rivera said. "We're getting to that point in the year where certain guys you can do that with."

Cornerback Daryl Worley (elbow) returned to practice as a limited participant Friday and is also expected to play.

Linebacker Shaq Thompson, who injured his knee against the Cardinals, has officially been ruled out, along with left tackle Michael Oher (concussion) and defensive tackle Vernon Butler (ankle).

ROSTER MOVE: In the event Kalil cannot play, the Panthers brought in some added insurance. Guard Tyler Larsen, who started 52 games at center for Utah State, was promoted from the practice squad. Tight end Scott Simonson was waived.

Backup center Gino Gradkowski played well in Kalil's absence last week and would serve as his replacement against the Rams.