Samuel (groin) is on the field for Friday's practice, Matt Maiocco of NBC Sports Bay Area reports.
While the extent of his participation remains to be seen, a return to practice Friday represents progress for Samuel after an absence from last week's loss to Seattle and missed practices this Wednesday and Thursday. Initial reports suggested he'd miss one or two games due to a groin strain, so it won't be too surprising if he makes it back for Sunday's matchup with the Bengals.