"In terms of playing style, he is not too far away from John Terry," Hart, who is now director of youth football at Portsmouth, told the London Evening Standard. "I think [England coach] Fabio Capello likes that type of defender.
"He is a fantastic header of the ball, but he can pass like a midfielder. His only weakness is that he struggles to pick up pace over the first few strides, but that's the case for a lot of big guys.
"I keep in touch with Michael when I can, as I do with all the young players I had at Forest. He is probably benefiting from a manager who shows more belief in him."