Green Bay Packers right guard Marco Rivera could miss 2-4 weeks of action after spraining the medial collateral ligament of his left knee in Saturday night's game against the Carolina Panthers, GM/Head Coach Mike Sherman announced Sunday.

"Because of who it is and the way that he's been able to come back from injuries in the past, I wouldn't rule him out for the opener (Sept. 7 vs. Minnesota)," said Sherman. "He plans on playing in that game. For that to happen, though, he needs to exhibit a certain level of strength in the knee."

Last season, despite tearing the MCL in his left knee Sept. 22 at Detroit and spraining the MCL in his right knee Nov. 17 at Minnesota, Rivera did not miss a start, extending his personal starting streak to 67 games - the fourth-longest active string among Packers. He also previously played through a broken left hand, suffered late in the 2001 season.