The Gurkha has "met with a further setback" and underwent surgery on Friday night, Coolmore announced on Twitter.

Plans are fluid for Aidan O'Brien's Classic-winning colt, who returned to his home at Ballydoyle on Saturday morning.

Coolmore said in a three-part tweet: "Classic-winning miler The Gurkha, last seen winning the Sussex (Stakes at Goodwood), has met with a further setback.

"He was referred to Fethard Equine Hospital and underwent surgery last night.

"He was discharged this morning and is back in his box. Future plans will be announced at a later date."