Cornerback Brandon Flowers will miss the Chiefs' second preseason game at St. Louis on Saturday with his lingering bruised foot that he initially injured July 31.
Coach Romeo Crennel said the injury isn't necessarily worse than initially thought, but that the team's doctors are "trying different things" with Flowers to get the foot to heal.
"He's getting better slowly, not fast enough, but all we can do is kind of hang on and see what happens."
Flowers has tested the foot, but hasn't returned to team activities, and Crennel declined to speculate if he could play if the regular season started this weekend.
"Well, that's only if he wanted to push it," Crennel said. "If he wanted to go try then he would do that. But I don't think that realistically you could try to say whether he would or not right now. I wouldn't want to make that conjecture."
Flowers is one of the NFL's best young cover corners, and a critical component for the Chiefs after they lost Brandon Carr to Dallas in free agency. Kansas City signed former Raider Stanford Routt to fill Carr's starting job.
On the flip side, Flowers' injury has allowed the coaching staff to take a longer look at younger player such as Jalil Brown.
"He's making good progress," Crennel said. "He's been out there and he's been competing and he's understanding the defense and what he has to do. You gain more confidence in a guy when he's able to go do that."