(AP Photo/Rick Scuteri)

Oakland Raiders general manager Mike Mayock told disgruntled receiver Antonio Brown it's time to decide whether he's "all in or all out" about playing this season after losing a fight with the NFL and NFLPA over his helmet.

Mayock issued a statement to reporters that the Raiders released in a video on Twitter expressing his frustration that Brown didn't participate in practice Sunday despite being healed from the frost-bitten feet that have sidelined him for most of training camp.

"You all know that A.B. is not here today. So here's the bottom line. He's upset about the helmet issue. We have supported that. We appreciate that," Mayock said. "But at this point, we've pretty much exhausted all avenues of relief. So from our perspective, it's time for him to be all in or all out. So we're hoping he's back soon. We've got 89 guys busting their tails. We are really excited about where this franchise is going and we hope A.B. is going to be a big part of it starting Week 1 against Denver. End of story. No questions."

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