In this photo from Dec. 30, 2018, Pittsburgh Steelers wide receiver Antonio Brown stands on the sideline before an NFL football game against the Cincinnati Bengals, in Pittsburgh. Pittsburgh Steelers head coach Mike Tomlin says he's disappointed in the behavior of star wide receiver Antonio Brown but added the team has not received any formal trade request from Brown's camp. (AP Photo/Don Wright)

In this photo from Dec. 30, 2018, Pittsburgh Steelers wide receiver Antonio Brown stands on the sideline before an NFL football game against the Cincinnati Bengals, in Pittsburgh. Pittsburgh Steelers head coach Mike Tomlin says he's disappointed in the behavior of star wide receiver Antonio Brown but added the team has not received any formal trade request from Brown's camp. Brown did not play in Pittsburgh's victory over Cincinnati in the regular season finale due in part to a lack of communication from Brown about his health. (AP Photo/Gene J. Puskar)

In this photo from Dec. 30, 2018, Pittsburgh Steelers wide receiver Antonio Brown stands on the sideline before an NFL football game against the Cincinnati Bengals, in Pittsburgh. Pittsburgh Steelers head coach Mike Tomlin says he's disappointed in the behavior of star wide receiver Antonio Brown but added the team has not received any formal trade request from Brown's camp.(AP Photo/Don Wright)

Pittsburgh Steelers wide receiver Antonio Brown stands along the sideline in street clothes before an NFL football game against the Cincinnati Bengals, Sunday, Dec. 30, 2018, in Pittsburgh. (AP Photo/Don Wright)