The NFL season is officially back, but unfortunately, that means injuries are as well. It's been just one week, but all 32 NFL teams are dealing with different ailments -- some more serious than others.

San Francisco 49ers running back Christian McCaffrey is going to be out for at least the next four games. Per ESPN's Adam Schefter, the 49ers will place

The 49ers won without Christian McCaffrey in their season opener and now must try repeating that trick for at least the next month. McCaffrey, the NFL’s reigning rushing champion and AP Offensive Player of the Year,