The defender has been at the club since 2003 and has the task of leading the team out on the pitch.
Lewis Dunk said: “I am not the biggest talker in the dressing room, I am not the leader in that way. I lead in slightly different ways, I am more everyday at the training ground and showing the other boys how we should act and lead by example. We have our conversations in the changing rooms, and we talk like men and sit down and have it out with each other.”
Dunk will next wear the armband on Saturday against Liverpool in the Premier League.