It's a given Arizona Cardinals rookie safety Tyrann Mathieu the once embattled former LSU and St. Augustine standout will have enormous support Sunday at the Mercedes-Benz Superdome when he returns home to take on the New Orleans Saints.

But it's unlikely Mathieu will have a bigger supporter in the building than Cardinals cornerback Patrick Peterson -- his friend former LSU teammate and current teammate big brother mentor and otherwise lifeline.

"We're practically brothers" Peterson said. "I feel that I'm the big brother role model type for him. I'm definitely not taking that duty lightly."

Supporting and believing in Mathieu has come natural for Peterson who first took the eager freshman who would later become known as the "Honey Badger" under his wing in Peterson's junior year at LSU. No one has been prouder of the strides Mathieu has made on and off the field in relatively short amount of time than Peterson.

He has watched the young safety already make a huge impact on the field punching the football out of the hands of St. Louis Rams tight end Jared Cook for a touchdown-saving forced fumble in Week 1. Last Sunday against Detroit Mathieu tackled Lions receiver Nate Burleson short of the first-down marker on the final drive to preserve the Cardinals' 25-21 victory their first of the season.

"Like I said once we drafted him he was going to be one of the guys that helped us get over the hump by taking the ball away from offenses getting those key stops when we need to get off of the field." Peterson said of the 5-foot-9 186-pound defensive back. "He brings energy to the Arizona Cardinals' defense.