Overview

• Cornell Armstrong was placed on injured reserve with a hamstring injury sustained in the loss to Carolina and will miss at least four games.
• Miami signed safety Jordan Colbert to the active roster after he debuted in Week 3 on special teams.
• Cornerback Kendall Sheffield joined the practice squad, bringing 49 games and 20 starts of NFL experience.
• Coach Mike McDaniel said the Dolphins will add a true nickel corner and make additional roster moves this week.
• The secondary remains thin with Kader Kohou and Artie Burns out for the year, Jason Marshall on IR, and Storm Duck still sidelined, and the pass defense ranks last in opponent passer rating and completion percentage.