Mullings (ankle) was estimated to be a DNP on Wednesday, as the Titans held a walk-through practice, Jim Wyatt of the Titans' official site reports.
Mullings was active for the team's Week 3 loss to the Colts after missing one week of action with an ankle injury. The running back has now opened this week as a nonparticipant, and he'll have two more chances to return to practice ahead of Sunday's matchup with the Texans.