World champion Amir Khan will not agree to fight Michael Katsidis, the Australian's trainer has told the BBC.
Katsidis stopped the previously unbeaten Kevin Mitchell earlier this month and there have been rumours of a match-up with Khan this summer.
"I really don't see it happening. This is a very risky fight for Amir and one they would not take at this stage," said Brendon Smith.
Katsidis could fight Manchester's John Murray next time out.
Smith claims that WBA title-holder Khan has already turned down the chance to take on the hard-hitting Katsidis.
"There was an opportunity for the two to fight in Amir's US debut, but it was turned by Freddie Roach [Khan's trainer] and instead Paulie Malignaggi was chosen," said Smith.
Khan put on a classy performance in his first fight in America on 16 May, stopping home-town favourite Malignaggi in the 11th round at New York's Madison Square Garden.
On the same night, WBO interim lightweight champion Katsidis destroyed West Ham fan Mitchell inside three rounds at Upton Park.
The 29-year-old Queenslander had already demonstrated his punching power to British fans in a brutal five-round hammering of Luton's Graham Earl at Wembley on his UK debut in 2007.
Though Katsidis would have to move up to face Khan, his camp is confident of adding Bolton's light-welterweight champion to his list of British scalps.
"I've spoken to Richard Scheafer [CEO of Golden Boy, Khan's promoters] who likes the idea and would like to do a fight with Katsidis and Khan," said Smith.
"There is no better fight in England than Amir Khan versus Michael Katsidis. Can Michael get the hat-trick? Yes he can. Can the fight be made? I don't think so."
Khan has said that he wants to unify the light-welterweight division and is thought to be weighing up a potential bout with mandatory challenger Marcos Maidana of Argentina.
Khan is also targeting unification fights against Americans Timothy Bradley, the WBO light-welterweight champion, and WBC and IBF light-welterweight king Devon Alexander.
A clash with unbeaten British and European lightweight champion Murray could be more likely for Katsidis, with Smith suggesting that discussions have already begun.
"I was contacted by Murray's promoter Mick Hennessy the day after the Mitchell fight. He reckons they could draw a 20,000 crowd in Manchester," said Smith.
"Murray has called Michael out on several occasions, saying Katsidis has not beaten the best in the UK. Fair enough, that's his opinion.
"Michael loves boxing in England because of the atmosphere and the passion of the fans.
"I've not had an offer put before me, but if the money is right we will travel to Manchester for the fight. The ball is in John and Mick's court on this one."
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