The Packers appear to have just witnessed what could be a major injury to top wide receiver Randall Cobb.

Cobb caught a pass during Green Bay's game against Baltimore before a helmet collided with his knee. After hitting the ground, Cobb clutched his knee and appeared to be in a lot of pain.

Cobb was then carted off the field with what appeared to be a serious knee injury.

The Packers also sustained a leg injury to James Jones, who was taken to the locker room. He won't return to the game.

The Packers are down to Jordy Nelson and Jarrett Boykin as their top receivers for the remainder of the day.

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Aaron Wilson covers the Ravens for The Baltimore Sun.