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.