Derby hero Masar will miss Saturday’s Coral-Eclipse at Sandown due to a late setback.
Charlie Appleby’s charge was set to try to supplement his Epsom victory in the 10-furlong feature, but he was found to be sore following exercise on Friday and all plans are now on hold.
The trainer said: “Unfortunately after exercise this morning, when he was cooling out, he had inflammation and soreness in his right off-fore.
“It was under observation during the course of the day and we felt this afternoon the soreness and the inflammation were still there.
“After speaking to His Highness Sheikh Mohammed, his first concern was to make sure that we were doing what was right for the horse and best for the horse.
“He is under veterinary observation and until the inflammation comes down, we won’t be any wiser as to what extent of an injury we are dealing with. It will be over the course of the next 48 hours.
“First and foremost we need to get the inflammation down – that is what our priority is. It looked like it was a bang, but until the inflammation comes down, you don’t know.
“We’ve got an inflamed right fore that is sore and we need to investigate once we reduce the swelling.”
Masar’s absence means the John Gosden-trained Roaring Lion looks likely to sent off favourite for the Group One highlight.
Roaring Lion is the new 7-4 (from 3-1) favourite with the sponsor Coral for the big race.
Saxon Warrior is 9-4 second favourite, ahead of his Ballydoyle stablemate, Happily, at 5-1.
“It’s hugely disappointing for connections and race fans that Masar has been ruled out of a Coral-Eclipse rematch against Roaring Lion and Saxon Warrior, but we still have an exciting contest to look forward to, with the former shading favouritism having finished one place ahead of the latter at Epsom last time,” said Coral’s David Stevens.