Things are unraveling in Pittsburgh.

Steelers wide receiver Antonio Brown did not report for work on Monday, one day after he appeared upset on the field and left the locker room in a hurry following a 42-37 loss to the Kansas City Chiefs.

It remains unknown whether Brown’s absence was excused by Mike Tomlin, but according to Ed Bouchette of the Pittsburgh Post-Gazette, many people inside the Steelers organization didn’t know why Brown didn’t show up with the rest of his teammates for meetings and film review.

On Monday, Brown responded to a message on Twitter from a former Steelers employee who claimed Brown wouldn’t have the same success if he didn’t know with Big Ben, Brown responded by tweeting, “Trade me let’s find out”:

Trade me let’s find out https://t.co/4OeepI78zy — Antonio Brown (@AB84) September 17, 2018

This issue is the latest misstep by the All-Pro WR, who in the past month alone has posted controversial messages on social media, including threatening to punch a reporter who wrote a story about him.