Mitchell (knee) isn't practicing Wednesday, Matt Maiocco of NBC Sports Bay Area reports.
Mitchell came back from a three-game absence and took 44 touches over the final two weeks of the regular season, but he's still bothered by his knee, with head coach Kyle Shanahan saying Monday that the running back's practice reps could be limited. The rookie is still expected to play in Sunday's wild-card game against the Cowboys, assuming he gets back on the practice field Thursday or Friday without any setbacks.