49ers leave 53-man roster spot open after placing CMC on IR NBC Sports Bay Area49ers place McCaffrey on IR; out at least 4 games ESPNNiners placing Christian McCaffrey (calf/Achilles) on injured reserve; RB to miss at least four games NFL.comNFL injury tracker Week 2: Christian McCaffrey out, Tee Higgins doubtful, A.J. Brown questionable Yahoo SportsChristian McCaffrey injury: What Fantasy football managers should do as 49ers RB heads to injured reserve CBS Sports