Harbinger sustains serious injury

Harbinger, the impressive winner of the King George at Ascot has suffered a career-threatening injury on Newmarket's gallops on Saturday, according to sources at Highclere Thoroughbred Racing.

Michael Stoute's colt had been working over 7f on the Limekilns gallops with stablemate Ask when getting injured.

The four-year-old, who landed the King George by 11 lengths in record time last month having also taken the Hardwicke Stakes at Royal Ascot, had been due to run at York in the Juddmonte before a shot at the Prix de l'Arc de Triomphe on 3 October, for which he had been favourite.