The 2011 season was the Kansas City Chiefs' 42nd in the National Football League (NFL), their 52nd overall and their third under the head coach/general manager tandem of Todd Haley and Scott Pioli. A 10–6 record in their 2010 season lent high expectations to their 2011 season, but the Chiefs suffered reversed fortunes. A season-ending hand injury to their starting quarterback Matt Cassel in their eighth game of the season proved especially significant.