49ers star RB Christian McCaffrey (calf) won't play in preseason

(Photo credit: D. Ross Cameron-USA TODAY Sports)

Christian McCaffrey won't play this preseason for the San Francisco 49ers as he recovers from a calf strain.

McCaffrey strained the calf on Sunday and had to sit out team drills. When the Niners practiced Tuesday, McCaffrey did not participate, leading coach Kyle Shanahan to confirm the injury.

The reigning NFL Offensive Player of the Year is expected to miss at least one