The former captain, 29, revealed the secrets in a chat with funnyman James Corden ahead of the game against Algeria.
Terry, who was stripped of the captain's armband by Capello, said of the manager: "He keeps his distance a little bit. He can be quite scary at times.
"When you walk past him in the morning he gives you a little 'good morning' and that's it. It works well I think because on the field he's brilliant, he takes all the training sessions himself and I've been really impressed with him actually."
Referring to the current no-nonsense regime, he added: "We have to be in our rooms and, sort of shut away, by 11 o'clock."