The Kansas City Chiefs insisted Wednesday that Jamaal Charles has passed a battery of tests and does not show signs of a concussion, one day after the star running back said he exhibited symptoms in last weekend's win over San Diego.

Charles took a blow from Brandon Flowers when he dove into the endzone Sunday. Charles popped up and trotted off the field, and trainers met him on the sideline. He remained in the game.

On Tuesday, Charles told ESPN Radio that he saw "light bulbs" a few plays later, and that he tried to avoid going through the league's concussion protocol.

After the Chiefs learned of the interview, they put Charles through a battery of tests. The team said he passed all of them.