Antonio Brown's messy start with the Oakland Raiders continued to develop on Thursday when the wide receiver "got into it" on Wednesday with general manager Mike Mayock, according to Adam Schefter.
The altercation occurred after Brown posted a photo of the letter Mayock sent him regarding over $50,000 in fines for missing practice.
"When your own team want to hate but there's no stopping me now," Brown wrote on his Instagram story. "Devil is a lie. Everyone got to pay this year so we clear."
"Antonio Brown is not in the building today," Mayock said in a press conference Thursday. "He's not going to be practicing. I don't have any more information. When we do, I'll get it to you. That's it for today."
"After a screaming match, Brown told Mayock that he would hit him in the face and then punted the ball … and said, 'Fine me for that,'" Rapoport tweeted.
According to ESPN, the Raiders plan to suspend Brown.
The altercation is only the latest headline in Brown's first season with his new team. Brown was initially held out of training camp due to a mysterious foot injury that turned out to be frostbite caused by improper footwear during a cryotherapy treatment.
Displeased with being unable to wear his preferred helmet, which no longer met NFL standards, Brown went "radio silent" with the Raiders and filed two grievances with the league.
Mayock told reporters it was time for Brown to be "all-in or all-out" with the team.
Brown eventually chose a new helmet and it appeared the offseason saga would be over until Wednesday's Instagram post, which has now escalated.
It is unclear how long the Raiders plan to suspend Brown for. The NFL's collective bargaining agreement states that the maximum suspension for conduct detrimental to the team is four weeks.
Regardless of whether Brown is on the field, the Raiders kick off their season on Monday against the Denver Broncos.