The severity of the injury is unknown at this point, but according to ESPN.com's Calvin Watkins, Lee wasn't happy that he had to be helped from the field.
Sean Lee swearing as he is helped to the trainers room as pictures are being taken. "Bleep me," he says. pic.twitter.com/lMOZKgG71O— Calvin Watkins (@calvinwatkins) May 27, 2014
“I haven't been healthy the last couple of years, but I have shown the ability to come back fully healthy and at times even better,” Lee said in January, according to the Dallas Morning News. "I think that's something that I will continue to do. The key now is to be on the field for the entire year and contribute the entire year."
Lee sprained a ligament in his neck last December and missed the Cowboys' final three games of the 2013 season. And in 2012, he played in just six games after he was sidelined with a toe injury.
A 2010 second-round pick, Lee signed a six-year extension with the Cowboys prior to the 2013 season.