Out with the old for the San Francisco 49ers , and in with the new . And now, the latter is part of Kyle Shanahan ’s running back update that fantasy managers need to know.

Brian Robinson Jr. has secured the No. 2 spot behind starter Christian McCaffrey , according to ninersnation.com.

The trade for Robinson from the Commanders turned out to be a bad thing for Isaac Guerendo.

49ers hand backup RB job to Brian Robinson Jr.

Guerendo reportedly had fumbling problems in practice, which helped Robinson take over the lead role. However, Shanahan said Guerendo isn’t completely out of the equation.

”I don’t think that he’s gotten lost [in the rotation],” Shanahan said. “I just think he’s competing. (And) I think he was the third back last year, then a couple guys got hurt, and he g

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