FILE - In this Nov. 22, 2020, file photo, New Orleans Saints defensive line coach Ryan Nielsen looks on during an NFL football game against the Atlanta Falcons in New Orleans. A person familiar with the situation says Nielsen has agreed in principle to become LSU’s next defensive coordinator. The person spoke to The Associated Press on condition of anonymity on Monday, Jan. 18, 2021, because some contractual details were still pending. (AP Photo/Tyler Kaufman, File)