Thornton (undisclosed) exited Tuesday's practice on a cart, Nate Taylor of ESPN.com reports.
The reason behind Thornton's exit has yet to be disclosed. He's been firmly in the mix for a top-three spot on the Kansas City wide receiver depth chart, but if Thornton is required to miss time, fifth-round rookie Cyrus Allen and 2025 fourth-round pick Jalen Royals would get increased opportunities to make an impression on the coaching staff.