The Raiders elevated Hemby from the practice squad to the active roster Saturday.
The move gives the Raiders some added insurance in the backfield in the scenario that Ashton Jeanty (ankle) is unable to play against the Patriots on Sunday. Hemby was signed by the Raiders in late April as an undrafted free agent, and the rookie out of Indiana was signed to the team's practice squad in early September after failing to make the 53-man roster at the end of training camp.