Raiders wide receiver Antonio Brown missed practice Sunday over the helmet issue that has plagued his offseason.
Oakland general manager Mike Mayock issued a statement announcing Brown's absence and didn't take any questions on the matter.
"At this point, we've pretty much exhausted all avenues of relief," Mayock said. "So from our perspective, it's time for him to be all in or all out."
Brown left camp on July 30 after experiencing "extreme frostbite" on the bottom of his feet caused by a cryotherapy machine. While Brown was away from camp, he also filed a helmet grievance with the NFL, which he lost.