Gross was blocking midway through the second quarter when a Falcons player fell into his leg, which bent awkwardly. The medical staff put a brace on Gross' leg and ankle before he was carted to the locker room.
Travelle Wharton moved from left guard to Gross' spot, and Mackenzy Bernadeau replaced Wharton.
Gross, who signed a six-year, $60 million contract with the Panthers during the offseason after reaching his first Pro Bowl, has missed only one game in his seven-year NFL career.
Copyright 2009 by The Associated Press