Guard Zack Heberer missed USC’s past two games after suffering turf toe at Oregon State on Sept. 25.

Regarding Joe McKnight’s case, which had him in a boot Monday, USC coach Pete Carroll said: “This is a hard one to tell. Obviously this is a real critical and painful injury for a running back particularly, but it’s hard on everybody.”

With Stafon Johnson (illness) and Allen Bradford (hip) also missing practice, redshirt freshman Broderick Green moved up to the No. 2 tailback spot behind C.J. Gable.

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