Running back Trent Richardson, whom the Raiders played on the non-injury list before the start of training camp with was activated by the team Thursday and practiced, per NFL.com.
The Raiders never specified why Richardson wasn't ready, but reports suggested that the back did not come to camp at the team's expected weight. The former first-round pick will have to make an impression to land a starting job, with Latavius Murray turning heads with his speed out of the backfield.