"Bears running back Matt Forte is believed to have suffered an MCL sprain in his right knee, according to a league source.

Forte, though, will require further testing for he and the Bears to have a full handle on the severity of his knee injury.

He suffered the injury in the first quarter, when Kansas City Chiefs linebacker Derrick Johnson drilled him in the right knee. He was tended to on the field, and he walked off under his own power, with a slight limp."