CHARLOTTE, N.C. (AP) The Carolina Panthers began preparing for Sunday's regular season opener against the Jacksonville Jaguars without starting center Ryan Kalil and defensive tackle Star Lotulelei.

Kalil is still recovering from a left knee sprain, while Lotulelei has missed the entire preseason with a stress reaction in his surgically repaired right foot.

Both players worked on the side with the athletic training staff during practice Monday and their status for game remains uncertain.

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Starting cornerbacks Josh Norman and Charles Tillman returned to practice after sitting out the preseason finale against the Pittsburgh Steelers with concussion-like symptoms. Defensive end Charles Johnson also returned to practice after battling left calf and right hand injuries that kept him out of all four preseason games.

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