LOS ANGELES -- Outside linebacker Khalil Mack 's left elbow injury, which left him sidelined and in a sling for much of the Los Angeles Chargers ' Week 2 victory over the Las Vegas Raiders , isn't season-ending, a source confirmed to ESPN.

NFL Network was the first to report the news.

Chargers coach Jim Harbaugh said Wednesday that Mack will be placed on injured reserve. Mack will miss at least the next four games. Harbaugh declined to specify the details of Mack's elbow injury.

"He's like the Wolverine," Harbaugh said. "One of the toughest things I've ever seen."

Mack attempted a tackle in the first quarter, but his left hand got caught between Chargers linebacker Troy Dye and Raiders wide receiver Tre Tucker , turning the elbow to an awkward position.

Mack jogged off the f

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