Amir Khan has more things to worry about than just the controversial decision in his loss to Lamont Peterson.
That is the view of Khan's former promoter Frank Warren, who believes the Olympic silver medallist will be in for a tough fight if he secures the desired rematch with Peterson.
Khan is lodging a complaint through official channels after seeing local favourite Peterson snatch his WBA and IBF light-welterweight belts with a split-decision win in Washington at the weekend.
The 25-year-old is unhappy not only with referee Joseph Cooper deducting him a point on two occasions for pushing, but also with the judges' scoring of the fight.
However, Warren, speaking to BBC Radio Five Live, said: "I think more importantly if there is a rematch, what I was concerned with was how easy Peterson, who is not a big, big puncher, was finding it to catch Khan, especially with the right hand.
"It seems to me in his last few fights, against (Marcos) Maidana and Peterson, he's making real tough work of fights people thought he would win much easier.
"The fight was very close, you could call it one way or the other, but that's not the point.
"The point is you look at what's happening during the fight and he was making extremely hard work of what a lot of people felt would be quite comfortable.
"He wasn't emphatic enough in the fight and I think the rematch will be a tougher fight for him because Peterson is holding all the cards now."
Warren added: "Talk about him fighting Floyd Mayweather and all this hysteria about he's going to be the best pound-for-pound fighter on the planet is a bit premature and I really don't think he should be going up a weight to even think about Mayweather unless he was looking for a big payday.
"His defence is not as good as it should be. He went to America to work on that and to me it's not something that seems to be successful as far as he's concerned."