ENGLISH champion jockey Frankie Dettori has been refused permission to ride in Malaysia. One of racing's best ambassadors was due to appear at the biggest meeting of the season in the northern state of Perak next weekend and also on November 25 and 26. But the powerful Malaysian Jockeys' Association has objected to Dettori's planned appearance and the country's Immigration Department has refused to issue a work permit without a supporting letter from the body. Trainer Malcolm Thwaites, based in the tin-mining town of Ipoh where the meetings will be held, had engaged Dettori to ride during his annual visit to the Newmarket horses in training sales last month. 'I am very disappointed indeed, it is a blow. Frankie is a superb rider and just the type of crowd-puller you want for meetings like this. 'I never thought for a moment there would be a problem with the licence when I sent in the application. 'It was actually approved by the state racing authority but it requires Immigration Department approval and they need the letter from the Jockeys' Association,' explained an upset Thwaites from the Malaysian capital of Kuala Lumpur last night. 'It would have been absolutely fantastic to have him and done wonders for the crowd. My own jockey is out of action with a broken collarbone and what a magnificent stand-in Frankie would have been.' Another Malaysian trainer, Alex Rogers, is currently suing the Jockeys' Association because they belatedly withdrew their approval of a licence for a Panamanian rider. This came after an original agreement and the trainer was left with a bill of GBP20,000 after bringing the jockey to the country. Dettori has agreed to ride for Thwaites at the important Lion City Cup meeting in Singapore in January and is not expected to have any visa or permit problems there. Dettori was due back in Newmarket yesterday after riding Bullwinkle to 10th in the Melbourne Cup. His next overseas venture will be the Japan Cup and then on to Hong Kong to ride for Godolphin at the International Races at Sha Tin on December 10.