Just four weeks after returning to the field, San Francisco 49ers running back Christian McCaffrey is out again.
49ers head coach Kyle Shanahan told reporters Monday that McCaffrey suffered a posterior cruciate ligament (PCL) injury during Sunday's 35-10 loss to the Buffalo Bills, and will be placed on injured reserve as result. McCaffrey's recovery is expected to be six weeks, meaning that the rest of his season is in jeopardy.
Additionally, Jordan Mason — who took over as RB1 after McCaffrey left Sunday night's game — is going on IR after suffering a high ankle sprain.