New Orleans' running back Reggie Bush will have an MRI on his injured left knee to determine the extent of the damage. It was first believed that he had a minor sprain, but a test will be exercised anyway. Noted orthopedic surgeon Dr. James Andrews will look at the images following the MRI. Saints' coach Sean Payton said Saturday the results are expected early next week. Bush was hurt when he was pushed out of bounds in the first half of Thursday night's 27-24 loss in Chicago.