Oakland Raiders wide receiver Antonio Brown sat out the Raiders' practice on Sunday, General Manager Mike Mayock said as he issued Brown an ultimatum about his participation on the team.
Multiple outlets are reporting that Brown was not present for the Raiders' practice today. Mayock told reporters that Brown is still upset about not being able to use his preferred helmet after losing an arbitration hearing with the NFL. That's when he told the media that he wants Brown to decide whether he's "all in or all out."
"Here's the bottom line: He's upset about the helmet issue," Mayock said to reporters, including the San Francisco Chronicle's Matt Kawahara.