Running back Kendall Hunter tore the anterior cruciate ligament in his right knee Friday at practice, the team confirmed Saturday morning.
Hunter has served as the top understudy to Frank Gore since breaking into the league in 2011, aside from missing the final two months of the 2012 season with a torn Achilles.
Candidates to fill the 49ers’ No. 2 tailback job are LaMichael James, Carlos Hyde, Jewell Hampton and Marcus Lattimore, who’s on the non-football-injury list but has been doing conditioning drills on a side field in camp.
This opens the door for Carlos Hyde to back up Frank Gore. Marcus Lattimore is also in the mix.