The son of Selkirk was bought with the intention of racing in Dubai this winter and may not run again beforehand.
Under the care of Marcus Tregoning, Highdown has made rapid strides this season, achieving the most important victory of his career when holding off Shaanmer to win the group II Prix Guillaume d'Ornano at Deauville last month.
That triumph had been preceded by an easy victory in Newbury's Steventon Stakes, in which Highdown came home an easy five lengths clear of Godolphin's Tobougg. On his first run of the season, Highdown caught new stablemate Moon Ballad in the final stride of a Newmarket Listed race.
Tregoning had been gearing the rest of Highdown's campaign around the Dubai Champion Stakes, but yesterday Godolphin racing manger Simon Crisford revealed that the Newmarket race was no longer top priority.
He said: "Immediate plans for Highdown are on hold, though it's probably unlikely that he will run again in Europe this season."