In a follow-up text message, Lang told ESPN.com: "I'll be all right. It's nothing serious."
Lang added that it is not an ACL injury.
Left guard Josh Sitton, one of Lang's best friends on the team, said: "He seemed like he'll be all right."
It's unclear if Lang will be able to play next Sunday against the Chargers in the final game before the bye. The injury occurred when someone appeared to roll in Lang's right knee. Josh Walker finished the game in Lang's place (although Don Barclay took one series).
Two other Packers players dropped out of the game and did not return: outside linebacker Nick Perry (shoulder) and nose tackle B.J. Raji (groin). Perry had shoulder surgery in the offseason. Raji was able to return to the sideline but did not play after his injury.