FRISCO, Texas _ David Irving was on crutches, trying to steady himself, with his left foot in a boot.
Dak Prescott walked past as the defensive tackle turned to leave the Cowboys locker room.
"You OK?" the quarterback asked.
"Yeah," Irving said. "It hurts though.
"A lot."
Irving injured himself in Thursday's practice and was carted off the field. X-rays were negative. The initial diagnosis is a high-ankle sprain, an injury that should keep him from playing Monday night against Tennessee and beyond.
Irving was on his way to see team physician Dr. Dan Cooper for a more thorough evaluation as he left the locker room.
"Can't now," Irving said when asked if he could stop to talk. "Going to get another opinion.
"I should know more tomorrow."
The defensive tackle was suspended for the first four games of the season for a violation of the NFL's substance abuse policy, an infraction Irving has said was tied to his use of marijuana. He returned but didn't play against Houston in Week 5 as he was embroiled in a custody dispute with his former girlfriend, Angela Sanchez, over their 5-year-old daughter.
Irving has played in the team's last two games, recording one sack and two quarterback pressures. He has also knocked down a pass and has three tackles.
