The New One will not run at Aintree next month after being ruled out for the rest of the season.
The high-class hurdler, trained in Naunton by Nigel Twiston-Davies, is suffering with a spinal issue but will not require an operation.
Twiston-Davies said: "He's not too bad, but we've stopped him for the season now.
"He's got a 'kissing spine' but he'll be OK in time.
"He won't need an operation but we will give him a break."
The New One was set to defend his title in the Aintree Hurdle at the Crabbie's Grand National meeting on April 9 after disappointing in the Champion Hurdle at Cheltenham earlier this month.
