Ryan Mathews questionable after sitting out third straight practice

An ankle injury sidelined the Chargers’ featured back for a third consecutive practice Friday. Ryan Mathews is officially questionable for Sunday’s game, per the club’s report. According to the NFL’s injury terminology, “questionable” entails a 50-50 percent chance of playing. The Chargers (8-5) host AFC West-leading Denver on Sunday. The 27-year-old Mathews suffered the ankle…