Mack is active for Sunday's game against the Dolphins, Kevin Bowen of 107.5 The Fan Indianapolis reports.
As is Jonathan Taylor, who has been managing a knee issue, as well as change-of-pace back Nyheim Hines. In that context, Mack and Jordan Wilkins are on hand in reserve, but they don't appear destined for high-volume roles in Week 4, barring in-game developments that would change that.