What happened: Justin Fields and Garrett Nussmeier are competing behind Patrick Mahomes, while Kansas City evaluates crowded races at receiver and tight end. Jake Briningstool is pushing Jared Wiley, Tre Watson and Mason Pline for work behind Travis Kelce and Noah Gray.
Why it matters: The Chiefs must determine whether to carry a third quarterback and how much depth they need behind Rashee Rice, Xavier Worthy and Tyquan Thornton. Those choices will shape the 53-man roster and expose players to waivers on cutdown day.
By the numbers: Kansas City has three projected starting receivers, five backup contenders and six potential practice-squad candidates. Four players are competing for roles behind Kelce and Gray at tight end.
What to watch: Saturday's preseason opener will provide the first game test for the backup quarterbacks and roster-bubble pass catchers. Blocking behind Kelce also bears watching.