"I'm really pleased that Virgil Hunter is to become my new trainer," Khan said when announcing the news. "Everyone in boxing knows about his skills and the success he has enjoyed over the last few years. I'm looking forward to the start of my training camp and working on some new things with him.
"With Virgil in my corner, I know that I can get back to the very top of the light-welterweight division."
As part of his plan to do that he will have to beat the undefeated Molina, who has 17 wins and a draw from his 18 bouts so far.
"Molina is a good fighter, who has yet to taste defeat, so I know that he will be very dangerous," Khan added. "He's a tricky fighter who possess a lot of natural speed. I always want to face hungry young fighters and in Molina I'm up against a guy who has ambitions of world title success."
Khan will face Molina in the United States, with the date still to be decided.