The Bucs signed Desir to their practice squad Monday, Greg Auman of The Athletic reports.
Desir had three interceptions -- including a pick-six -- last year as he spilt time with the Jets and Ravens. He joined the Seahawks this offseason but was released a week before the 53-man roster deadline. The 31-year-old will have a chance for a promotion if Sean Murphy-Bunting (elbow) has to miss an extended period of time.