Thomas first injured his leg at Atlanta on Nov. 13. After missing the ensuing two contests, he returned to the lineup Dec. 4 at Chicago but aggravated the injury.
Paris Lenon, who has started three games this season at the 'Will' (weak-side) linebacker in place of Thomas, is expected to start in the regular season finale against the Seattle Seahawks.
The team's primary starter at ‘Will' prior to the injury, Thomas came to Green Bay from the St. Louis Rams for cornerback Chris Johnson in a Sept. 3 trade. In 10 games this season (nine starts), he collected 51 tackles (30 solo) and one interception.
The Packers' active roster currently stands at 52 players.