Oakland Raiders general manager Mike Mayock is running out of patience for Antonio Brown’s antics. With Brown once again missing training camp Sunday due to his ongoing helmet issue, the Raiders GM issued an ultimatum to his star receiver.

“You all know that AB is not here today, right?” Mayock told a group of beat reporters as practice began Sunday afternoon per Paul Gutierrez of ESPN. “So, here's the bottom line: He's upset about the helmet issue. We have supported that, we appreciate that. 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, OK? 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 AB's going to be a big part of it, starting Week 1 against Denver. End of story. No questions, OK? Just wanted you guys to know where we were. Fair?”

Brown had only just returned to practice last week following his extended absence due to frostbite on his foot due to a cryotherapy mishap.

During that time, he had also been unhappy about his helmet situation. The league is no longer allowing him to wear his Schutt Air Advantage helmet, the only helmet he has worn in his NFL career, because it is older than 10 years.

Mayock and the Raiders made a big move by trading a third- and a fifth-round pick for Brown in March, but they are quickly getting a taste of all the baggage Brown comes with. And based on Brown’s history, there’s a decent chance he won’t respond too positively to Mayock’s ultimatum.