Oakland Raiders wide receiver has a decision to make after his grievance against the NFL denied regarding the use of his helmet.

On Monday, ESPN's Adam Schefter reported an arbitrator ruled against Brown's effort to wear his old helmet. Brown confirmed the ruling in a post on his Instagram account, adding that he is "working on getting back to full healthy and looking forward" to rejoining his teammates.

Brown filed a grievance in hopes the NFL would allow him to continue using the helmet he's used during his first nine seasons. The fiasco has played itself out behind the scenes throughout the offseason, as the NFL implemented a new rule banning Brown's favored helmet over safety issues.

Michael Silver of NFL Network first reported on the helmet issue, which began during organized team sessions. Brown reportedly became incensed that he was no longer allowed to wear his preferred helmet, saying quarterbacks would not be treated the same despite the rules also applying to Tom Brady and Aaron Rodgers.