New Kansas City Chiefs quarterback Justin Fields is winning the backup QB job with ease so far at camp. The Kansas City Chiefs have concluded OTAs, with mandatory minicamp set to begin this week on June 9, and the latest quarterback news centered around backups Justin Fields and Garrett Nussmeier. Fields entered the spring as the presumptive QB2 after the Chiefs unexpectedly traded for the former Chicago Bears, Pittsburgh Steelers, and New York Jets starter.