The drama in Pittsburgh apparently started during a walk-through practice on Wednesday when Brown got into a heated dispute with an unnamed teammate. CBS Sports NFL Insider Jason La Canfora has reported that the unnamed teammate was Roethlisberger. Things apparently got so ugly that Brown picked up a football and chucked it at Big Ben.
lthough the Steelers' injury report indicated that Brown was having an issue with his knee, the report also said that he missed practice due to a "coach's decision." As it turns out though, it was his own decision to miss practice. According to the Post-Gazette,
Brown skipped practice for the rest of the week following the dispute with Roethlisberger and didn't even bother showing up for the team's walk-through practice on Saturday.
The craziest part of this situation is that despite all of this, Brown apparently still showed up to Heinz Field on Sunday expecting to play. When he found out he was going to be inactive, he stayed at the stadium until halftime, but then decided to leave Heinz Field, even though the Steelers were trailing 10-3 and their playoff hopes were on the line.
https://www.cbssports.com/nfl/news/antonio-brown-refused-to-practice-in-week-17-after-heated-dispute-with-ben-roethlisberger/