Riley (undisclosed) was activated off the reserve/COVID-19 list Wednesday.
Riley was sidelined for Miami's win over the Saints, but he is expected to return Sunday against the Titans. Before his absence, he had totaled 10 tackles across 72 defensive snaps during his three previous contests. He's expected to have a similar workload in Week 17 as he operates as the primary backup to Elandon Roberts and Jerome Baker.