By Chris Emma

CHICAGO (CBS) — The Bears are currently without their top three cornerbacks after Tracy Porter suffered a concussion in Saturday’s preseason contest against the Chiefs.

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Porter took the knee of teammates Harold Jones-Quartey to the head. He stayed down on the field for several minutes before walking off with the help of trainers. The Bears announced that Porter had entered the league’s concussion protocol.

After the game, Porter had expressed confidence to teammates that he could be back in time for Week 1.

“He’s our leader,” Jones-Quartey said of Porter.

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Bears cornerback Kyle Fuller is currently recovering from a knee scope last week, and Bryce Callahan is dealing with a hamstring injury.

The Bears started Porter and Jacoby Glenn at cornerback Saturday. Rookie Deiondre’ Hall stepped in for Porter after the injury.

At the time of Porter’s injury, the Bears trailed the Chiefs 6-0. They would go on to lose the game 23-7.

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Chris Emma covers the Bears, Chicago’s sports scene and more for CBSChicago.com. Follow him on Twitter @CEmma670 and like his Facebook page.