SARASOTA, Fla. — The Oakland Raiders will be without three cornerbacks for Sunday night’s game at Miami.

The Raiders said Friday that David Amerson (foot), Gareon Conley (shin) and Demetrius McCray (knee) have all been ruled out for the game against the Dolphins.

Oakland has several other key players listed as questionable, including starting right guard Gabe Jackson (ankle); linebackers Cory James (knee), Marquel Lee (ankle) and Nicholas Morrow (ankle); safety Karl Joseph (groin); and fullback Jamize Olawale (hamstring).

The Raiders could get by activating second-round safety Obi Melifonwu from injured reserve this week. He has been out since training camp with a leg injury.

NFL CONCUSSION PROTOCOL

Steps all NFL teams must follow when a player show signs of a head injury:

1. Player must be removed from game and evaluated by club medical personnel with results compared to the player’s baseline assessment.

2. An unaffiliated neurotrauma consultant will work on the sideline with club medical personnel to implement concussion evaluation procedures.

3. A spotter in the press box with access to multiple replay views will help in the recognition of injury.

4. A player determined to have a concussion must be removed from the field and observed in the locker room by qualifying medical personnel.

5. A player can return to the field when his cognitive and balance functions are observed to have return to his baseline status.

Source: National Football League

For more on the San Francisco 49ers, see Grant Cohn's "Inside the 49ers" blog.