Walls recorded one tackle in Thursday's preseason game against the Bengals.
Walls was the first to come off the bench at outside cornerback, replacing the team's top CB Darius Slay, and also worked on Detroit's first-string special teams unit. Though just halfway through the preseason, Walls appears to be entering the 2016 campaign safely on the team's roster and only behind the aforementioned Slay, Nevin Lawson and slot-man Quan Diggs at cornerback.