Raiders coach Jon Gruden, Saints coach Sean Payton shown not wearing masks on sideline - USA TODAY

Despite a warning from the NFL last week, Jon Gruden and Sean Payton were shown not wearing masks in Monday night's matchup. https://www.usatoday.com/story/sports/nfl/2020/09/21/jon-gruden-sean-payton-masks-not-wearing-coronavirus-raiders-saints/5861047002/