GLENDALE - The "Honey Badger" is about to get his first NFL start.

Cardinals coach Bruce Arians said rookie Tyrann Mathieu will start at free safety for injured Rashad Johnson on Saturday against visiting Dallas.

Mathieu has been a sensation in camp as he looks to make a comeback after being booted from LSU for marijuana use.

Extra points

• The players association tentatively agreed to let the NFL take 40 blood samples for HGH tests each week during the season, with a violation drawing a four-game suspension.

• President Obama will welcome Don Shula and the 1972 Dolphins next Tuesday at the White House to honor the only team to go 17-0. The team was denied a ceremony in 1972 because of Watergate.

• The Steelers put WR Plaxico Burress, 36, on the injured reserve list after he had rotator cuff surgery.