Lee is listed as having a knee injury but little else is known at this time.
Sean Lee hurt his left knee in practice and is getting further evaluations according to coach Jason Garrett.
— Calvin Watkins (@calvinwatkins) May 27, 2014
We never tell people to assume the worst but given that this is the Dallas Cowboys and Sean Lee feel free to let your mind wander.
During his NFL career Lee has dealt with neck and hamstring issues. Lee has missed 18 games over the first four years of his NFL career.