Lang injured the ankle in the first quarter of Sunday's loss to the New Orleans Saints but did not incur "major structural damage," according to the report.
According to the director of public relations for the Packers, Lang was injured on an extra point attempt.
It remains unclear whether Lang will be able to play in Green Bay's Nov. 9 game against the Chicago Bears, according to the report.
"Not sure about a timetable yet," the source said.
Lang, 27, has started all but one regular season game over the previous three seasons. The Packers are 5-3 and in second place in the NFC North.
- Chris Johnson