EL SEGUNDO, Calif. – The Los Angeles Chargers went into training camp expecting their offensive line to be a major strength. Now, four games into the season, injuries have left the group depleted at the two most important spots.

Offensive tackle Joe Alt is undergoing testing after hurting his ankle in a 21-18 loss to the New York Giants on Sunday. Coach Jim Harbaugh did not provide details about the injury, which is reportedly a high ankle sprain.

“No, I don’t know the severity,” Harbaugh said. “Dealing with an ankle, and getting imaging right now.”

Alt was in a walking boot for the second half, leaving the Chargers (3-1) without both of their projected starting tackles coming into the season. Rashawn Slater tore the patellar tendon in his left leg during practice on Aug. 7, less th

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