Jash is unlikely to be seen until later in the season, having knocked a joint.
The Simon Crisford trained three year-old, ran second in the Middle Park Stakes last season – and after a delayed start to his three year-old campaign, he was a narrow winner at Newmarket in late May.
Jash was last seen finishing down the field in the Commonwealth Cup at Royal Ascot but will not be on the racecourse again for some time.
“Jash has actually just knocked a joint and has had a hold-up,” said owner Sheikh Hamdan Al Maktoum’s racing manager, Angus Gold.
“They did an MRI on it last week to make sure, so he’ll just have a couple of quiet weeks. He’ll definitely be out until the autumn anyway.”
Gold added: “It doesn’t sound like there’s anything nasty – the MRI will show if there’s anything, (but) hopefully not.
“It’s been a frustrating season with him, and I think he’ll only be better next year in any case. It’s just annoying at the moment, especially given how the three-year-olds dominated the July Cup.
“Whatever happens he’ll be a fresh horse, whenever he does make it back.”