Khan, who will meet Carlos Molina in Los Angeles on December 15, severed his ties with Roach following back-to-back defeats and will now be aiming to return to winning ways against the unbeaten American.
Former WBA and IBF light-welterweight champion Khan cited a lack of training time with Roach as one of the major reasons behind his decision to change trainer and is hoping things will be different under Hunter.
He said: "We have changed a lot of stuff for this upcoming fight, first of all the trainer which I think is a massive part of the camp.
"The reason I had to change trainer is because when you are always winning a fight you never look at the bad points but when you lose a fight you sit down with your team and you go through the whole camp and where you think you went wrong.
"Freddie is a great trainer but I wasn't getting everything I wanted.
"Freddie is a very busy guy and one of the best trainers in the world, I personally the one who called Freddie on the phone and told him I would no longer be training with him."
The 25-year-old also confirmed he had spoken to several trainers, including Floyd Mayweather Snr, but was comfortable with Hunter and felt he was the right man to progress his career.
"I spoke to Virgil and the first thing I said to him was that you have Andre Ward and I hope you are not going to be busy like Freddie was with Manny Pacquiao and I do get 100 per cent of your time," he said.
"He made it clear he is going to be with me 100 per cent and whenever I need him he is going to be there - he wants a fighter/trainer relationship where we speak together and get on well together."
Following defeats to Lamont Peterson and Danny Garcia, Khan is all-too-aware that he is far from the finished article inside the ring and is ready to utilise the knowledge of his new coach.
He said: "I'm still not 100 per cent, I've still got room for improvement and it is maybe going back to the basics and looking at where I make mistakes and improving them.
"I'm an offensive fighter and I need my trainer to teach me the defensive part of training whilst at the same time remaining as offensively good.
"So that is what we are going to be working on, we know exactly what we have to do. We have never really had a defence if you think about it."
Khan feels that Hunter can also get him behaving like a true boxer again as opposed to letting the red mist descend if a bout is not going in his favour.
"My main style was a boxer, using my brains and stuff, and then when you start winning fights so comfortably you can forget about the meaning of being a boxer," he said.
"What Virgil wants me to do is go back to the boxing again but be a smart boxer and understand what I have to do.
"That is a big part on Virgil too because he has to teach me what he wants me to do and it is about sticking to a gameplan because sometimes when I see red I forget about the gameplan and go all out."
Olympic silver medallist Khan is confident he can reclaim a world title within the next 12 months and is hopeful his legions of fans will continue to support him.
He said: "It is an ideal fight for us, we have to win this fight to come back and be right at the top.
"I can promise you next year we will fight for a world title and win a world title and become a world champion again.
"I hope the UK fans turn up, I'm sure Molina is going to bring a big fanbase and I'm sure my UK fans plus my American fans are going to turn up and we will make sure we finish the year with a bang."