The Chiefs recently added two cornerbacks, veteran Orlando Scandrick as a free agent and rookie Charvarius Ward in a trade with the Dallas Cowboys. Those moves plus Amerson's poor preseason performance made him expendable.
Amerson was the victim of multiple big plays in each of the Chiefs' first three preseason games. He didn't play in the fourth game.
"At some point, I think he just lost his confidence," Lawson said.