The team said Ryan met with coach Sean Payton on Friday.
Payton interviewed University of Georgia defensive coordinator Todd Grantham on Thursday. But Grantham announced on Friday he had withdrawn from consideration for the job.
Payton fired defensive coordinator Steve Spagnuolo and announced he wanted to switch to a 3-4 defense two days after returning from a yearlong suspension. The Saints allowed more total yards in a single season than any team in NFL history.