Herbert had six carries for 38 yards and three catches for 11 yards in Saturday's 20-13 preseason win over Miami.
The rookie sixth-round pick was the third running back through the rotation, behind only David Montgomery (who left after one snap) and Damien Williams. Herbert took advantage, and he was the primary running back during a mid-game stretch where rookie QB Justin Fields led the Bears to 17 points in a span of three drives. The roster numbers for Herbert are still tough if Tarik Cohen (knee) ever makes it back from the PUP list, but so far the rookie is doing his part to convince the team to keep four tailbacks even after Cohen returns.