Chargers Khalil Mack injures left arm, imaging Tuesday

Los Angeles Chargers linebacker Khalil Mack left Monday night’s game against the Las Vegas Raiders in the first quarter after suffering a severe left arm injury and will undergo imaging on Tuesday to determine the extent, coach Jim Harbaugh said. The injury occurred at Allegiant Stadium in Las Vegas late in the opening frame as Mack and teammate Troy Dye converged on Raiders receiver Tre Tucker.

Mack extended for the tackle and his left arm became trapped between players, bending at an unnatural angle. He immediately signaled distress, was tended to on the field, walked to the sideline holding his wrist and was taken to the medical tent before exiting to the locker room. The Chargers initially listed the injury as a wrist or hand problem and later described it as an elbow injury; the team at one point listed him as questionable to return before downgrading him to out, then later cleared him to return to the bench with his arm in a sling and a brace.

Mack had recorded one tackle, one sack and one tackle for loss in the opening quarter before leaving the game. The Chargers went on to beat the Raiders 20-9. Harbaugh said after the game, according to the team, that Mack would have...