Tyrann Mathieu moving around on defense

Cardinals rookie defensive back Tyrann Mathieu, mostly a cornerback in college at LSU, is working at safety as well as at corner in the nickel package, reports ESPN.

"He's learning how to play safety," coach Bruce Arians said. "He can cover sideline to sideline. He's shown the range, he's shown the speed to fill the alley, and I know he can tackle. He knows how to play nickel. He's played it his whole life, so that's a natural for him. I love the competition that he's bringing, picking up some older guys' games to stay with him."

Mathieu said he's more comfortable playing inside.

"I'm a ball hawk," he said. "Too many times on the outside you've got to focus on your man rather than just vision the quarterback. I like inside cornerback way more. You see the quarterback and it just gives you more opportunities to make a play."