EAST RUTHERFORD, N.J. -- Los Angeles Chargers left tackle Joe Alt exited the first quarter of Sunday's game against the New York Giants on a medical cart with what the Chargers called an ankle injury.

Alt was ruled out of the game in the beginning of the second half and the initial belief is that he suffered a high ankle sprain, a source told ESPN's Adam Schefter.

Giants outside linebacker Kayvon Thibodeaux fell into Alt's right leg during a play early in the first quarter. Alt limped off the field and removed his helmet, winced in pain and struggled to put weight on his right ankle.

Alt returned to the sidelines in the second half in street clothes and with a boot on his right ankle.

If Alt misses significant time, it would be a major blow to the already injury-laden Chargers'

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