Is this the week that San Francisco 49ers running back Christian McCaffrey returns? McCaffrey has missed all eight of his team's games this season so far. For more than nine weeks, the reigning Offensive Player of the Year has been working his way back from an Achilles injury that he has battled since training camp.

With Christian McCaffrey expected to play on Sunday, head coach Kyle Shanahan explains how the scheme will change with the return of the 49ers star.