49ers Running Back Christian McCaffrey Head Back To IR

SANTA CLARA, Calif. (AP) — San Francisco 49ers running back Christian McCaffrey will not need surgery on his injured right knee but he will miss the rest of the regular season. Coach Kyle Shanahan said McCaffrey will be out at least six weeks after injuring his posterior cruciate ligament in a loss to the Buffalo Bills. McCaffrey will be placed on injured reserve for the second time this season after previously missing the first eight games with Achilles tendinitis The 49ers also lost McCaffrey’s backup to an injury. Jordan Mason is also set to go on injured reserve after suffering a high ankle sprain in the game.