"We all figured the worse the way he went down," Packers coach Mike McCarthy said today. "It's going to be at least a couple of weeks."

Collins sprained a ligament in his left knee yesterday in Green Bay's 33-22 victory over the Kansas City Chiefs as the Packers improved to 7-1. Collins was injured while tackling wide receiver Samie Parker early in the third quarter. As Collins collided with Parker, Collins' knee was bent back.

Collins, a third-year safety who has started all 40 games in his career, had an MRI done that revealed no damage, but he couldn't bend his knee after the game and needed crutches.

"Everybody saw it, it looked a lot worse on film," McCarthy said. "The evaluation was actually positive, the MRI was positive."

McCarthy said Collins would not need surgery.

Rookie Aaron Rouse is expected to take Collins' spot in the lineup after filling in for the rest of the game against the Chiefs.