Rainbow And Gold's participation in the Vase is hanging in the balance after Brian Kan Ping-chee's stayer scoped badly yesterday. 'He's got a bit of a cough and when he was scoped he had some mucus and blood in his windpipe,' the champion trainer said. 'I will have to see how he is over the next couple of days before I know whether he can run.' The Jockey Club said Rainbow And Gold would be scoped again on Friday to assess his fitness but, if he has to be scratched, a replacement is unlikely at this stage. Rainbow And Gold has been working well recently and his withdrawal would be another blow for Kan, whose challenge has already been weakened by the absence through injury of Derby winner Industrial Pioneer and 2000 QEII Cup hero Industrialist. Kan's only other entry is Red Pepper in the Mile. Sprint hope King Of Danes is also due for veterinary reassessment after displaying a stiff action in his off-hind leg when walking last Friday after he had worked. He is believed to have been kicked by another horse. Tony Cruz's four-year-old, who was third in the race last year, is expected to have a searching gallop tomorrow morning. Singapore's Bocelli, meanwhile, was found to be sore yesterday. The Cup entry's hoof wall was broken away and the shoe was holding on by a single nail. Bocelli was fitted with a glue-on shoe and is to be re-examined. It will be musical chairs in the English commentary box at Happy Valley tonight when the seven races will all have different callers. Along with regulars Darren Flindell and David Raphael, who will call races three and six respectively, the other commentators in race order are former Hong Kong caller Richard Hoiles from Britain, Wayne Wilson from Brisbane, Bryan Martyn from Melbourne, Greg Miles of Australia's Sky Channel and Paul Dolan, also from Brisbane. 'This is the third year we've done it and we think it adds another bit of international flavour,' said Nuno Fernandes, telecast manager of the English racing service. 'We will also use the visiting commentators on Sunday to give us some guest analysis on the overseas runners.' The final foreign runner is due to arrive today in the shape of Hong Kong Mile aspirant Eishin Preston, but the Japanese representative nearly didn't make it at all. A second blood test had to be performed by the Japan Racing Association before the Kyoto Mile Championship runner-up fully satisfied all the quarantine procedures. 'It was touch and go whether the test results would be back in time for the horse to make it here, but the JRA was able to convince the testing laboratory to give it priority and it was done just in time. All's well that ends well, I suppose,' said the Jockey Club's director of racing, Winfried Engelbrecht-Bresges. Singapore-based trainer Laurie Laxon has called in the heavies to have everything right in the Hong Kong Vase preparation of last season's New Zealand Oaks winner, Tapildo. Outstanding Australian heavyweight rider Shane Scriven was leading the Singapore jockeys' championship in the middle of this year when his contract there was completed and he was unable to gain an extension. 'I didn't ride for four months when I went home to Brisbane, but the phone rang one day and it was Laurie asking me to help out with this mare,' Scriven said. 'She can be an extremely difficult ride in her work - actually a real so-and-so sometimes - so Laurie was after someone who could stand over her a bit. At the moment my weight has ballooned to 62 kg [139 pounds] after not riding for that time so I'm a bit of a match for her. 'She pulled hard the first day and left me a bit sore but we're right now. I will say this, she's a very tough, genuine mare and the big names won't want to make too many mistakes.' Scriven, who normally rides around 56.5 kg (127 pounds), said he was exploring career options for early next year, including a possible stint in Macau. It is part of folklore in newspaper racing sections everywhere that a mistake in the form guide usually turns out to be a winner - so beware Felix Coetzee in tonight's International Jockeys' Championship after the Jockey Club omitted him altogether from most of the advance publicity for the event. Coetzee, who joins Douglas Whyte and Eddie Lai in the Hong Kong side, was the last name confirmed for the series, having won his chance on the Club's criterion as the second-ranked rider here behind Whyte by the end of last Wednesday's meeting. That may explain his omission from posters and press profiles, but for the record Coetzee has a CV that stacks up nicely against his rivals. Three times South Africa's champion jockey, Coetzee has won more than 2,600 races in his career, including more than 50 Grade One wins in his home country before adding top-level victories in the Hong Kong Gold Cup, Champions & Chater Cup, Stewards' Cup and Centenary Sprint Cup during nine extremely successful seasons in Hong Kong.