Jon Gruden, left, is announced as the head coach of the Oakland Raiders with owner Mark Davis at the team facility in Alameda, Calif., Tuesday, Jan. 9, 2018. Heidi Fang Las Vegas Review-Journal @H …

Jon Gruden, left, is announced as the head coach of the Oakland Raiders with owner Mark Davis at the team facility in Alameda, Calif., Tuesday, Jan. 9, 2018. Heidi Fang Las Vegas Review-Journal @HeidiFang