Gregory was eligible to return from suspension next month but unless he’s able to win an appeal, he won’t play at all this season.
Gregory was serving a 10-game suspension on top of the four-game suspension he received back in February for another violation of the NFL substance-abuse policy. He has failed four drug tests before this with the first violation coming at the scouting combine.
Gregory, 23, is a former second-round pick of the Cowboys back in May of last year. He’s currently in the second year of his four-year, $3.814 million contract that includes $1.404 million guaranteed and stands to make a base salary of $525,000 for the 2016 season.
In 2015, Gregory appeared in 12 games for the Cowboys and recorded 11 tackles and no sacks.