EL SEGUNDO, Calif. -- Tests confirmed a right ankle sprain for Los Angeles Chargers left tackle Joe Alt , who is "doubtful" in Sunday's game against the Washington Commanders , coach Jim Harbaugh said Wednesday.

Harbaugh said he didn't know if Alt would land on injured reserve.

"I don't want to speculate on the degree, but likely not to play this week, and we'll take it day by day," Harbaugh said.

Alt exited the first quarter of the Chargers' Week 4 loss to the New York Giants on a medical cart, after Giants outside linebacker Kayvon Thibodeaux fell into Alt's right leg during a play early in the first quarter.

Without Alt, the Chargers' offensive line's play was putrid. Quarterback Justin Herbert was hit 13 times and sacked twice, according to TruMedia. Alt's replacement,

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