The Colts signed Lammons from the practice squad to the active roster Tuesday.
Lammons was unable to make the Colts' 53-man roster at the end of training camp, but he will rejoin Indianapolis after JuJu Brents was placed on injured reserve due to a knee injury. Lammons had been elevated from the practice squad and played 22 snaps on special teams in the Colts' 29-27 loss to the Texans on Sunday. With Brents sidelined, Lammons is expected to provide depth in the Colts secondary behind corners Jaylon Jones and Kenny Moore.