Sean Lee not cleared by doctors

It appears the 2013 season is over for Sean Lee.

The Dallas Cowboys' starting middle linebacker hasn't been cleared by doctors to practice due to a sprained neck, and a source said it is doubtful he will play in the win-or-go-home game against the Philadelphia Eagles on Sunday night.

Lee has missed the Cowboys' previous two games with the injury and was hopeful he could return for the regular-season finale. Examinations revealed no structural damage.

Lee, called the quarterback of the defense by defensive coordinator Monte Kiffin, missed two games in late November with a hamstring injury. He returned for the Chicago game on Dec. 9 but suffered a neck injury in the third quarter and didn't return.