Oakland Raiders linebacker Khalil Mackdidn’t report Tuesday on the first day of the team’s mandatory three-day minicamp.Whether Mack shows up for the final two days remains unclear, but his head coach wouldn’t mind seeing the defensive star back on the field sooner than later.”I don’t know; I just hope so,” Jon Gruden said, via the Raiders’ official website. “One of the big reasons I came here was to coach that man, but I don’t want to speculate. There’s a lot of guys in the league, several players that are in a similar situation, and we’re just trying to resolve it as soon as possible. In the meantime, we’ll coach the players that are here.”Mack previously elected to not attend the voluntary organized team activities and was not subject to a fine. However, skipping the mandatory minicamp without a team-approved excusal creates a different scenario.The Raiders could apply monetary penalties on Mack for each day missed in the form of $14,070 for the first day, $28,150 for the second day and $42,215 for the third day.Gruden, however, deflected questions on if the Raiders would take that route with Mack.