Johnson suffered the injury late in the first quarter of Green Bay's 40-34 overtime loss to the Kansas City Chiefs at Lambeau Field. He was carted off the field. The full extent of Johnson's injury was shown by an MRI performed on Monday.
Johnson had started the first six games at the 'Power' (left) defensive end position for Green Bay. A disappointment since he signed with the Packers, he finished this season with eight tackles and no sacks. The two-time Pro Bowler started the first five games at 'Elephant' (right) defensive end in 2002 before suffering a torn left triceps in the second half of a win over the Bears in Champaign, Ill.
Johnson strained his right triceps Oct. 5 against Seattle and his Achilles Sept. 29 at Chicago.
Third-year pro Rod Walker played in Johnson's spot against the Chiefs. Veteran Chukie Nwokorie, who did not play Sunday because of a shoulder injury, also would be a candidate to replace Johnson at Power End.