EL SEGUNDO, Calif. -- Los Angeles Chargers left tackle Joe Alt will undergo season-ending ankle surgery, for the high right ankle sprain he sustained in the Chargers win over the Tennessee Titans , according to a team spokesperson.

The injury came in the second quarter, when Titans defensive tackle Sebastian Joseph-Day fell into Alt's right ankle.

It's the second high ankle sprain Alt has had this season. He exited the first quarter of the team's Week 4 loss to the New York Giants on a medical cart and missed the next three games with the same injury.

"I feel bad for Joe," coach Jim Harbaugh said, "but I know it's going to be OK."

Throughout the offseason, the Chargers boasted about having the league's best tackle duo -- with Alt and Pro Bowl tackle Rashawn Slater . Now the

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