Youth Dante Pettis jersey , C.J. Beathard will take over as starting QB The San Francisco 49ers season took a big swing on one player. Quarterback Jimmy Garoppolo suffered a knee injury in the fourth quarter, and head coach Kyle Shanahan said after the game that the trainers think it is a torn ACL. Garoppolo will undergo an MRI on Monday when the team returns to Santa Clara, at which point they will know for sure.Whatever the injury ends up officially being, Garoppolo is out indefinitely, and that means the backup quarterback gets the call. C.J. Beathard takes over as the starting quarterback, and Shanahan said the plan is to promote Nick Mullens from the practice squad to serve as his backup.This is not Beathard¡¯s first run as starting quarterback. The 49ers drafted him out of Iowa last year in the third round http://www.49ersauthorizedshops.com/authentic-fred-warner-je rsey , and he replaced Brian Hoyer midway through the season. Beathard eventually lost his job Garoppolo, but he made five starts (plus the second half against Washington) before then. In that run, he completed 54.9 percent of his passes for 1,430 yards, with four touchdowns and six interceptions.Beathard met with the media following the game and said he was ready to go. He met with Garoppolo and told the injured QB he is praying for him. Garoppolo told him, ¡°Lead these guys.¡±Fooch¡¯s update: Kyle Shanahan was asked about C.J. Beathard taking over as starter and offered a vote of confidence ¡ª The San Francisco 49ers dropped to 1-7 with their loss to the Arizona Cardinals Solomon Thomas jersey , and the snap count revealed some interesting decisions in Week 8. You can view the full snap count below, or check out the gamebook PDF.The 49ers did not get too crazy with the wide receivers on Sunday. Kendrick Bourne started opposite Marquise Goodwin, and they primarily played with two receivers. While Goodwin (61 snaps, 92%) and Bourne (54 snaps, 82%) played most of the game, Trent Taylor was the next receiver up Authentic Ahkello Witherspoon jersey , with 19 total snaps (29%). Dante Pettis returned to action from his knee injury and played seven snaps, while Victor Bolden played five snaps.Instead of going with extra receivers, the 49ers used two running backs fairly extensively. Kyle Juszczyk led the way with 47 snaps, followed by Matt Breida (31), Raheem Mostert (12), and Alfred Morris (11). Juszczyk has become a key cog in this offense Youth DeForest Buckner jersey , both as a blocking fullback and as the third down back.On defense, the secondary was fairly consistent, except for multiple injuries to the strong safety position. Jimmie Ward started at free safety and played all 66 snaps. Jaquiski Tartt started at strong safety, but a shoulder injury removed him after 25 snaps. Antone Exum replaced him and played 20 snaps, but then a concussion removed him from the game. Tyvis Powell closed out the game at strong safety, playing 21 snaps.That strong safety position will be something to watch this week against the Oakland Raiders. The 49ers are playing on a short week http://www.49ersauthorizedshops.com/authentic-arik-armstead- jersey , which means three days of recuperation and practice before Thursday¡¯s game. The extent of Tartt¡¯s shoulder injury is unknown for the time being, and Exum¡¯s concussion means he has to go through the protocol. If the 49ers are without Tartt and Exum, Powell would get the start. The team also could welcome Marcell Harris back off the NFI list this week. That will be a position to watch.49ers snap count vs. Cardinals, Week 8PlayerOffenseDefenseSTPlayerOffenseDefenseST