Sam Twiston-Davies is to take over the ride on four-time Ladbrokes World Hurdle winner Big Buck's when he makes his comeback from injury at Cheltenham later this month.
The Paul Nicholls-trained Big Buck's has not run since the Long Distance Hurdle at Newbury in December 2012, having been found to be suffering from a leg injury later that month.
He pleased in a racecourse gallop at Exeter before Christmas, and the Cleeve Hurdle on January 25 is his intended starting point before bidding for a fifth straight World Hurdle crown in March.
Unbeaten in 18 starts since reverting to hurdles, the 11-year-old has been ridden in all bar two of those runs by Ruby Walsh, with Tony McCoy deputising when Walsh was injured.
Owner Andy Stewart told The Sun: "We explored all sorts of possibilities but we had to make sure whoever rode Big Buck's in the Cleeve Hurdle would also be available for the World Hurdle.
"Ruby Walsh and AP McCoy will have other commitments.
"Daryl Jacob is Paul's stable jockey and our choice of Sam is no reflection on him. He will ride either Celestial Halo or Salubrious."
Twiston-Davies has spoken of his "absolute delight" at being handed the ride.
He said: "I am absolutely delighted to get the ride on a really exceptional horse like him and I'm very much looking forward to it.
"He is a legend of racing and he looks a pleasure to ride. It will take plenty of time to look at all his wins, and I will be very happy to watch every single one."