Oakland Raiders head coach Jon Gruden, center, greets James Stone as players stretch during NFL football practice in Napa, Calif., Wednesday, Aug. 1, 2018. (AP Photo/Jeff Chiu)

Oakland Raiders owner Mark Davis, center left, talks with head coach Jon Gruden as players stretch during NFL football practice in Napa, Calif., Wednesday, Aug. 1, 2018. (AP Photo/Jeff Chiu)