LOS ANGELES -- Coach Jim Harbaugh said Monday that Los Angeles Chargers running back Najee Harris has a season-ending Achilles tear.

Harris collapsed on a play-action play in the second quarter of the Chargers' 23-20 win over the Denver Broncos .

"It's unfortunate ... he was really playing good," Harbaugh said. "... Najee will be back. I have no doubt about it."

Harris, who signed as a free agent with the Chargers in March, landed on the non-football injury/illness list ahead of training camp after a July 4 fireworks mishap that damaged his eye.

He missed all the Chargers' training camp practices but was ready for the beginning of the season. The Chargers had been increasing Harris' workload each week, and Sunday, he appeared on track for his most carries and most productive game

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