49ers RB Christian McCaffrey ruled out, could be headed to IR

(Photo credit: David Gonzales-Imagn Images)
San Francisco 49ers star running back Christian McCaffrey has been ruled out of Sunday's game against the host Minnesota Vikings and could be placed on injured reserve.

McCaffrey is dealing with Achilles and calf injuries that caused him to be a game-day scratch for Monday's season opener against the New York Jets. The injury hasn't calmed down this week and San Francisco coach