ALAMEDA, Calif. — Star receiver Antonio Brown was sent away from the Oakland Raiders four days before the season opener amid reports he could be suspended over a confrontation with general manager Mike Mayock.

Mayock said at the beginning of practice that Brown wasn’t at the Raiders facility and wouldn’t be practicing a day after posting a letter from the GM on social media detailing nearly $54,000 in fines.

ESPN reported the two had a confrontation the previous day over the posting of the letter and that the Raiders plan to suspend Brown. Teams have the right under the collective bargaining agreement to suspend players up to four games for conduct detrimental to the team.

A suspension would also void the more than $29 million in guarantees over the next two seasons contained in Brown’s contract with the Raiders.

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