Joshua Buatsi must relocate permanently to the US to be with his new trainer Virgil Hunter, says Johnny Nelson.
Buatsi brilliantly knocked out Daniel Dos Santos on Saturday in Manchester in his first fight with Hunter in his corner.
Hunter previously led Andre Ward through a glorious career that culminated as the unbeaten No 1 boxer in the world and welcomed Buatsi to his California base two months ago.
"I haven't been home for weeks and weeks and weeks," Buatsi said beating Dos Santos.
"I look forward to having a week or so [at home].
"I'll be in England.
"Whether we go back out to America to start camp again, or we start [in England] and finish it out there."
But Sky Sports expert Nelson picked up on Buatsi's hesitation to commit to a full-time switch to the US.
"I know Hunter won't like that," says Nelson.
"It's hard for fighters to pack up and say: 'This is my new home'.
"Hunter wants his home to be his fighters' home so they live in the gym even without a fight coming up.
"Down the line, that may be a problem.
"It's something they must address, work out, figure out.
"It depends how much Buatsi wants it, wants success, respects Hunter and his word.
"'If I really want this, for five years I'm sticking with you!'"
Buatsi retained his WBA international belt to edge closer to a shot at the light-heavyweight division's elite, including champions Artur Beterbiev, Dmitry Bivol and Joe Smith Jr.
He had told Sky Sports last week about his first training camp in the US: "I'm a 10-hour flight away so, if I want a time-out, I can't go home. I have to stay. It's tough but these are the sacrifices you have to make.
"At this point, I'm willing to do anything to learn what I need to learn."
Hunter said last week: "I explained to him: 'If you want to get better, you have to make the sacrifice to live here'.
"If the opponent lives in the same city as their coach, they have an advantage.
"He can make a decision. It depends how much he wants it.
"I guaranteed him, if he lives in the Bay Area, he will improve two-fold."