Rivera is optimistic about Smith's status for the playoffs.
Smith had an MRI Monday and it revealed a sprained posterior cruciate ligament.
Rivera says Smith "will be treated week to week. It was good news considering the alternative."
The Panthers wrapped up a playoff spot Sunday against New Orleans, but can clinch the NFC South division title and a first-round bye in the playoffs with a win against Atlanta.
Smith injured the knee running a slant route in the first quarter and was taken to the locker room for observations. He returned midway through the second quarter and ran one route before taking himself out of the game.
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