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Stablemate Denman is 5/4 from 11/8 second favourite, with Exotic Dancer out to 14/1 from 10/1, while trainer Paul Nicholls is just 6/1 with Coral to have the first three home in the big race.
"The reports from Ditcheat that Kauto Star is back on track for the Gold Cup is not just good news for the many punters that have put their faith in the reigning champion, but great for racing in general, as it means the mouthwatering clash between stablemates is still on the cards," said Coral's David Stevens.
"Although there's very little between the two in the betting, Kauto Star is the proven champion and we would not expect this hopefully minor hiccup to jeopardise his status as Gold Cup favourite," added Stevens.