The NFL sent a warning letter to Bruce Arians and the Tampa Bay Buccaneers in the aftermath of Sunday's incident with the New Orleans Saints.
Mike Evans was suspended for one game following his altercation with Marshon Lattimore.
Arians, who was in the bench area generally, was clearly in the white stripe reserved for officials, players, and coaches during the altercation. He also was clearly involved in the verbal aspect of the incident.
The specifics of the warning from the league aren't known at this point.