Los Angeles quarterback Justin Herbert left the Chargers’ 20-10 loss to the Pittsburgh Steelers early Sunday after appearing to reaggravate the high-ankle sprain that had sidelined him in practice in the days leading up to the game. 

Herbert did not play the entire fourth quarter as the Chargers (2-1) lost for the first time, while Pittsburgh (3-0) remained undefeated under quarterback Justin Fields. 

Herbert completed 12 of his 18 passes for 125 passing yards, including a 27-yard…