The injury bug has taken a big bite out of the ' backfield. The team lost starter for the year in Week 1 due to a knee injury, and in Week 2, all three of their top backs went Keith Kinkaid Women Jersey down. (shoulder) is listed as doubtful for Sunday's primetime matchup with the , while fellow back (ankle) has already been placed on injured reserve.With all those backs down, it looks like Mirco Mueller Men Jersey Kyle Shanahan will be turning to rookie in Week 3. According to , Sermon is expected to start for the 49ers against Green Bay. If that's the case, he'll be the third starting running back for the club in three weeks.The 2021 third-round pick has carried the ball just once this season and exited last week's game due to a concu sion New Jersey Devils Jersey . He's since cleared protocol, which has cleared a path for him to make his first significant dent in the . During his final collegiate season at Ohio State, Sermon averaged 7.5 yards per carry Marcus Johansson Jersey . While he hasn't lived up to his draft billing thus far -- he was a healthy scratch in Week 1 -- the young back will get an opportunity to take the reins in a 49ers offense that loves to run the football. Even with all Andy Greene Jersey those injuries, the Niners entered Week 3 third in the league in rushing attempts (66).That said, even if Sermon is the first backup, the 49ers could continue to rotate backs, especially after activating veteran from the practice squad. San Francisco also has running backs and on the roster.