The 25-year-old was knocked out for the second time in his career when he was stopped in the fourth round in Las Vegas by underdog Garcia after being floored three times in the WBA and WBC light-welterweight unification fight.
Khan has outlined his determination to reclaim both titles but will review his relationship with Roach, admitting he is tired of constantly being number two to Manny Pacquiao, who the American also trains.
In quotes reported by the Daily Mirror, Khan said: "I want someone who is with me all the way through, like my conditioner Ruben Tabares is.
"It's hard when you're with Manny and have to be the number two.
"Every fight is a big fight for me, I'm fighting top-10 guys and so I need the best guys with me all the way through.
"Now is the best time to sort these things out and my team will talk things over with Freddie.
"There are a few things I have to change to benefit me.
"Maybe we have to see if I'm doing the right training and have the right sparring."