Champion jockey Ryan Moore will sit out the remainder of the July meeting at Newmarket following a barrier mishap.
Moore hurt his neck when his mount Newton's Law became trapped under the stalls before a race on Thursday.
The jockey was taken to hospital where he stayed overnight.
"He had a scan yesterday and they didn't find anything, but they kept him in overnight and he will be having another precautionary scan just to make sure there's nothing there," his agent Tony Hind said.
"He's fine in himself. He's a very tough boy."
Moore had a handful of rides for Aidan O'Brien booked for Saturday, including Due Diligence in the July Cup.