Chargers’ Mathews out with high ankle sprain

San Diego Chargers running back Ryan Mathews drags Oakland Raiders cornerback D.J. Hayden while gaining yardage on a run during the second half of an NFL football game Gregory Bull/AP

SAN DIEGO — Running back Ryan Mathews has been ruled out of San Diego’s game Sunday at Kansas City, which the Chargers must win to clinch a wild-card berth.

Mathews will miss his third straight game with what’s believed to be a high ankle sprain. He was hurt during a home loss to New England on Dec. 7.

Also ruled out on Friday was punter Mike Scifres, who broke his left collarbone in the loss to New England.

Wide receiver Keenan Allen is listed as doubtful with a broken right collarbone and is expected to miss his second straight game.

Rookie centre Chris Watt (calf) was limited in practice and is listed as questionable. If he can’t go, Trevor Robinson would become the fifth different Chargers player to start at centre this year.

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