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Smith, in his fourth year in the NFL, was injured in the fourth quarter of a 24-14 season-opening loss to Green Bay Monday night.

"He's not out for the season, but anything after that or short of that I don't know at this point", Fox said. "That would be purely speculation on my part without talking to the doctors."

Smith, 25, was Carolina's leading receiver last season, catching 88 passes for 1,110 yards and seven touchdowns. He's also a punt-returner.

"Obviously, that's a blow to lose a guy like Steve Smith", Fox said. "He's a big-play guy for us both offensively and in the kicking game. But injuries are part of football."

Rookies Keary Colbert, at wide receiver, and Chris Gamble, returning punts, likely will take on Smith's duties while he's gone.