The Buccaneers signed Desir off their practice squad Saturday, Scott Smith of the Buccaneers' official site reports.
The Buccaneers were already without Jamel Dean (knee) and Sean Murphy-Bunting (elbow) for Week 4, but Carlton Davis (abdomen/ribs) was also added to the injury report Saturday. Desir will join the active squad as a depth piece while Tampa Bay deals with injuries to its top three corners.