It's hard enough dealing with Buffalo Bills quarterback Josh Allen with a healthy defense.
The Kansas City Chiefs lost one of their best players in the first half of a divisional round playoff game on Sunday. Safety Tyrann Mathieu was diagnosed with a concussion and was ruled out for the game. That's a huge blow considering all that Mathieu does for the defense.
In the first quarter, Mathieu went low to tackle Allen on a run, and his teammate Jarran Reed inadvertently hit Mathieu in the head.
The Chiefs defense improved tremendously over the second half of the season.