(AP Photo/Charlie Riedel)

KANSAS CITY, Mo. (AP) The Kansas City Chiefs built a defense and signed a backup quarterback that were good enough to preserve a win.

Now, are they good enough to win on their own?

The Chiefs, who lost Patrick Mahomes to a concussion in the third quarter of Sunday's divisional-round win over Cleveland, might have to find out with their hopes of back-to-back AFC titles and a Super Bowl repeat on the line.

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