Crawford, who looked to serve a backup role on a thin Cowboys defensive line, fell to the ground Sunday night as he was doing slalom drills against tackling dummies, and he immediately yelled out about his Achilles, according to the Fort Worth Star-Telegram. His injury was confirmed to reporters by Cowboys executive Stephen Jones.
"I can't … believe this!" Crawford said as he pounded his hand into the ground.
Making matters worse for Dallas is defensive tackle Jay Ratliff injured his hamstring during a conditioning test this weekend, and he's out for the time being.
Last season, Crawford, a third-round draft pick in 2012, played in all 16 games and recorded 20 tackles. He was supposed to back up Anthony Spencer at defensive end this year, and if he performed well, there's been speculation that he might be Spencer's eventual replacement in the starting lineup if the Cowboys decide to let him leave for free agency after this season.