The Oakland Raiders have officially signed free agent linebacker Derrick Johnson to a one-year contract.
Coach Jon Gruden had said last week the sides agreed to terms and the contract became official on Monday. Oakland waived defensive back Darius Hillary to make room on the roster.
The Raiders also signed three players following tryouts at rookie minicamp over the weekend. Oakland gave deals to former Texas running back Chris Warren, Michigan fullback Henry Poggi and tight end Paul Butler from California of Pennsylvania.
Oakland cut running back Elijah Hood, defensive lineman Joby Saint Fleur and fullback Nick Sharga.