The Oakland Raiders defensive end Khalil Mack prepares to throw the ball during teams practice at Raiders Napa Valley training complex in Napa, Calif., on Monday, July 31, 2017. Bizuayehu Tesfaye …

The Oakland Raiders defensive end Khalil Mack prepares to throw the ball during teams practice at Raiders Napa Valley training complex in Napa, Calif., on Monday, July 31, 2017. Bizuayehu Tesfaye Las Vegas Review-Journal @bizutesfaye