EL SEGUNDO, Calif. (AP) — Under the best of circumstances, Los Angeles Chargers quarterback Justin Herbert would be facing a tough test from the Pittsburgh Steelers’ powerful pass rush on Sunday night.

Being without a proven starting left tackle after Joe Alt suffered a season-ending high ankle sprain last week will make things that much more difficult.

“As long as the season is, and as much adversity as we might deal with, the mission never stops,” Herbert said.

The Chargers (6-3) had big expectations coming into the year that the pairing of Rashawn Slater and Alt would drive one of the best offensive lines in football. But Slater tore his patellar tendon in August, and now Alt is done after sustaining a second injury to his right ankle in a 27-20 win at the Tennessee Titans.

That

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