The chief medical officer of the NFL defended the way the Indianapolis Colts treated Jacoby Brissett.

Brissett was placed into the NFL's concussion protocol when he reported symptoms after the game.

"All of our protocols were followed," Dr. Allen Sills said Tuesday on a league conference call. Sills added that Brissett "had no symptoms" and that there were "no findings" during the game to prevent him from returning to play.

Brissett passed three separate concussion tests, two during the game and one immediately afterward. He said it is not unusual for concussion symptoms to evolve and emerge in a delayed fashion.

Brissett reported the onset of what Sills said were "mild" symptoms about 20 or 30 minutes after the game.

"Out of an abundance of caution," he was placed in the protocol, Sills said.