Christian McCaffrey worries confirmed as 49ers place star on injured reserve New York Post Sources: 49ers RB McCaffrey on IR, out 4 games ESPNReport: 49ers’ Christian McCaffrey headed to injured reserve with calf injury Arizona SportsChristian McCaffrey injury: What Fantasy football managers should do as 49ers RB heads to injured reserve CBS SportsNiners placing Christian McCaffrey (calf/Achilles) on injured reserve; RB to miss at least four games NFL.com