Frankel is "very unlikely" to run at Newbury next month following the injury he sustained in Newmarket on Wednesday.
Winner of all nine of his starts to date, including the English 2000 Guineas, St James's Palace Stakes and Queen Elizabeth II Stakes last year, Frankel was due to make his seasonal re-appearance at Newbury on May 19.
However, Henry Cecil's colt looks set to miss that date and any future plan hinges on a second scan on his injured off-fore, which will not take place until next week.
Teddy Grimthorpe, racing manager to owner Khalid Abdullah, said: "Henry thought originally that he might have struck into himself on the gallop. He's a very exuberant and extravagant worker.
"The initial scan showed no damage and no hole and that led us to hope it was superficial or just a minor injury.
"But obviously, with a horse of this nature, we have to be incredibly careful, especially with injuries of this type in this area. He'll go into the Equine Hospital in Newmarket and have a scan on a big machine which will tell us definitely if there is any damage."