49ers coach reveals full extent of Christian McCaffrey injury after star man limped out of Bills game

Christian McCaffrey is expected to spend six weeks on the sidelines with a PCL injury, San Francisco 49ers head coach Kyle Shanahan has announced.

McCaffrey, who will not undergo surgery on the problem, hobbled off injured again after only recently making his long-awaited return.

The running back has been placed on injured reserve after his latest setback.

More to follow.