INGLEWOOD, Calif. -- Preliminary tests revealed that Los Angeles Chargers running back Najee Harris suffered an Achilles injury during Sunday's 23-20 win against the Denver Broncos , coach Jim Harbaugh said after the game.

Harris collapsed on a play-action play in the second quarter and immediately grabbed his left calf. The Chargers initially said he was questionable to return with an ankle injury before later ruling him out.

Harbaugh said Harris will undergo additional testing to determine the severity of the injury.

He added that he spoke with Harris at halftime and encouraged the veteran running back that he would be back on the field and in good shape in no time. Harbaugh said that Harris wasn't dejected, describing his demeanor as "cold-blooded."

Harris had a team-high 28 y

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