An outraged Danny Green has called for the NSW premier to establish an inquiry into the Combat Sports Authority of NSW after they refused to sanction his IBO cruiserweight world title defence against Paul Briggs.



The July 21 bout has been transferred from the Sydney Entertainment Centre to Perth's Challenge Stadium.



Asked on what grounds the CSA had knocked back the fight, Green said they had overridden the advice of a neurosurgeon at Sydney's Royal Prince Alfred Hospital and didn't feel that Briggs was ready to fight again after his extended hiatus.



CSA chairman Terry Hartmann defended his organisation's unanimous decision which they handed down last Tuesday night.



Hartmann told AAP there had been rumours that Briggs had neurological problems following his last fight in February 2007 and the CSA had written to the IBO champion's promoter requesting a detailed neurological report, and an up to date MRI.



He said the CSA had also suggested Briggs should have a couple of warm-up fights before taking on Green, who has won world title belts in three divisions.



Hartmann said the CSA had received an MRI from last February with a five or six line report.



"We wanted someone to examine the man (Briggs) and find out if he did have anything wrong with him in February 2007 and what his present condition was," Hartmann told AAP.



"There was no covering letter and there was no reaction to the suggestion that he have two warm-up bouts."



Hartmann said the safety of the boxer was his paramount concern.



Briggs said he was diagnosed in 2007 with adrenal burnout and his problems were related to the breakdown of his marriage and there were no neurological issues.



"There are few people that understand the reasons as to why I retired, what was going on in my personal life," Briggs told reporters.



"It had nothing to do with anything neurological."



Green hinted he could look at taking legal action after being forced to move the fight interstate.



"There are definitely going to be legal ramifications because of income and revenue that's going to be lost," Green said.



Hartmann said the CSA's medical official Amir Ibrahim had not been present when they made their decision as he was in South Africa, but had outlined detailed requirements.



Both Green and Briggs expressed their anger at the CSA's decision.



"I'm outraged and I'm strongly urging the premier of NSW to call an immediate inquiry," said Green, who felt the decision had given boxing "a black eye".



Briggs was adamant he was 100 per cent fit to fight.



"I'm so angry, you've got no idea," Briggs said.