Jonathan Martin, the Miami player whose allegations of bullying prompted an NFL probe, won't play again this season.
The Dolphins placed Martin on the reserve/non-football illness list on Saturday, ending the offensive tackle's season.
Safety D.J. Campbell was promoted from the practice squad to fill his roster spot.
Martin abruptly left the team in October, saying he had been bullied by teammates, charges that sparked a league probe of Miami's locker room.
The Dolphins' move comes after reports this week that Miami guard Richie Incognito, the teammate alleged to have bullied Martin, agreed to an extended suspension by the team.
Incognito had argued that NFL rules didn't allow the team to suspend him indefinitely.
But under a deal reported by NFL.com, the player agreed that he would stay away from the team until the league's special investigator Ted Wells concludes his inquiry into the club's workplace conduct.
Incognito will be paid for all but two games during his suspension, which began on November 3.
Incognito, 30, has denied bullying Martin but said he may have been too hard on his teammate and regrets using racist language.
