By Jelani Scott The star QB underwent further testing after sustaining the injury late in Thursday night’s loss to the Chiefs. View the original article to see embedded media. Chargers coach Brandon Staley revealed Friday that quarterback Justin Herbert sustained a fracture in his rib cartilage during Thursday night’s 27–24 loss to the Chiefs. The announcement comes only a few hours after NFL Network’s Ian Rapoport reported Herbert, 24, was set to undergo a “battery” of tests to determine the severity of the injury. Staley told reporters the team has listed the star QB as day-to-day, but remai…