Oakland Raiders veteran wideout Antonio Brown has filed a second grievance against the NFL following the news that he could not wear an “outdated” helmet that does not meet safety regulations.

After the first case was shot down, the 31-year-old wide receiver acquired by the Raiders in the offseason from the Pittsburgh Steelers, will reportedly plead his case in front of an arbitrator on Friday, per the NFL Network's Ian Rapoport.

Rapoport also adds that the grievance should be a “timely resolution,” with the aggrieved Brown headlining much of the offseason shenanigans surrounding the Oakland franchise.

Brown, the 5-foot-10, seven-time Pro-Bowl receiver, is a former second-round selection of the Steelers and spent eight seasons in Pittsburgh, leading the league in receiving yards and receptions twice apiece.

The Raiders traded a third- and fifth-round pick in exchange for the talented wideout, who was expected to be the star of head coach Jon Gruden's offense alongside quarterback Derek Carr.

However, since Brown's arrival—which has also been captured behind the scenes in the HBO sports docu-series “Hard Knocks”—the Raiders have only been swamped with coverage concerning Brown off the field, not on it.

Brown has been away from practicing due to a foot injury, rumored to be caused by not wearing footwear during cryotherapy, and he even threatened to retire from the game should Brown be unable to wear the “old” helmet. Brown finally returned to Oakland's training camp to practice in Napa, California, on Monday, however.

His (second) grievance case is still pending.