Tyrann Mathieu has been highly impressive in camp with the Arizona Cardinals.

One scout told Ron Wolfley of Arizonasports.com that Mathieu has been "pound-for-pound, the best player on the field." An offensive assistant added that the third-round draft pick is "going to change the team."

Mathieu will help the Cardinals fill holes in the secondary caused by the departures of Adrian Wilson, Kerry Rhodes and Greg Toler.