Vigil (back) returned to practice Wednesday, the Miami Herald reports.
Although eligible to practice, Vigil remains on the Dolphins' NFI list for the time being. He only participated in individual drills Wednesday, so he likely isn't completely recovered from the back ailment and remains without a definite timeline to return to game action.
Mitchel (hamstring) has been released by the Colts after reaching an injury settlement with the team, George Bremer of The Herald Bulletin reports.
Mitchel missed all of last season due to injury, and entered this season on the IR. He injured his hamstring in the team's final preseason game. The 24-year-old has yet to play in a regular season game.