The Buccaneers signed Melifonwu from the practice squad to the active roster Tuesday, Greg Auman of Fox Sports reports.
Melifonwu was elevated from the practice squad to the active roster for each of the Buccaneers' first three games of the regular season. He played solely on special teams in each of those contests, and he'll continue to serve that role now that he's on the 53-man roster while providing depth in the secondary.