Ruby Walsh has lost his appeal against a three-day ban incurred for careless riding at Cheltenham on Saturday.
He was found guilty of interference when partnering Pearl Swan to victory in the JCB Triumph Hurdle Trial.
While his mount beat Grumeti by a short head, the two horses got very close in the finish and the stewards opted to reverse the places and ban Walsh.
The British Horseracing Authority (BHA) dismissed his appeal at a hearing on Thursday morning.
Walsh will miss out on riding Zarkandar, last year's Triumph Hurdle winner, in the Betfair Hurdle at Newbury on 11 February.
He had said before the ban: "You'd never be optimistic [of getting it overturned], but I didn't think it warranted a three-day ban.
"It was very minimal interference and a very minimal offence, if I'm guilty of an offence."
Nicky Lander from the BHA said on Thursday: "I can confirm that Ruby Walsh's appeal against his three-day ban has been dismissed."
The BHA later tweeted that Walsh had successfully requested to defer the second day of his suspension, 12 February, due to there being Grade One action in Ireland.
He will now be free to ride at the Irish Hennessy Gold Cup meeting at Leopardstown and is banned on February 11, 13 and 14.
Walsh left London immediately to catch a flight back to Ireland where he was booked to ride last year's Grand National sixth The Midnight Club at Clonmel later on Thursday.
He tweeted: "Lost appeal but made flight hopefully the midnight club can bring some good out of the day!"