Mostert left Sunday's game at Dallas due to an ankle injury, Matt Maiocco of NBC Sports Bay Area reports.

Mostert logged a one-yard carry on the 49ers' first offensive play of the second half, but shortly thereafter he was seen grabbing at his left ankle on the bench, per Nick Wagoner of Deemed questionable to return, Mostert will finish Week 15 with 14 carries for 68 yards if he's unable to do so. In the meantime, Jeff Wilson will carry the load out of San Fran's backfield.

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