Oakland Raiders star Antonio Brown lost his grievance with the NFL in his battle to use a helmet that is no longer certified for practices or games.

An arbitrator made the ruling on Monday after holding a hearing with Brown, league representatives and the players’ union. Brown reportedly threatened to stop playing if he wasn’t allowed to use his old helmet.

RELATED: Antonio Brown Expected to Return to the Raiders Facility on Tuesday

Now it appears he’s trying to keep wearing his ‘model’ helmet. 

Flip the Page to Learn about the loophole and see his AB’s tweets. :