"I'm delighted to have signed a deal with Forest and I'm really looking forward to the task ahead. The history of the club sells itself and I had a chat with Sean O'Driscoll and liked what he had to say," he told Sky Sports News.
"I also met the chairman the other day and had a good look around the facilities and can tell it's a club going forward. One of the most important things for me were the assurances I was given by the owners.
"I've seen enough in football where owners come into the clubs, have a little flutter and then go away. I wanted to make sure that they are going to be here for the long haul and they assured me that they are. They have big plans for the club and I want to be a part of that."
Cox joined Albion from Swindon Town in 2009.