Trainer Rebecca Curtis has issued a warning to supporters of At Fishers Cross ahead of his run in the Albert Bartlett Novices' Hurdle at Cheltenham on Friday week.
Winner of all four of his starts this season, he beat The New One at Cheltenham on trials day.
However, all his winning form has come with plenty of cut in the ground and Curtis would like to see plenty of rain, which has been forecast, over the next few days.
"He's in really good form - we've never had him better - but the main thing is the ground," Curtis told At The Races.
"He's not proven on anything other than heavy.
"I think the horse would go on good ground but it seems to interrupt his jumping a bit when they go a bit quicker - he can get galloped off his feet.
"I think he'd be fine on the softer side of good but he wouldn't want it too quick."
Willie Mullins has given himself plenty of options in the race.
Ireland's champion trainer has one of the ante-post favourites in Ballycasey and has also left in his Supreme Novices' Hurdle candidate Un Atout, red-hot Neptune favourite Pont Alexandre and last year's bumper winner Champagne Fever.
Mozoltov and Inish Island are others options for Mullins while Noel Meade's Road To Riches, Charles Byrnes' Our Vinnie and Henry De Bromhead's Sizing Gold give Ireland a strong hand.
African Gold, Cloudy Copper, Gevrey Chambertin, who could run in the Martin Pipe Conditional Jockeys' Hurdle on the same day, Coneygree and Utopie Des Bordes are also among the remaining possibles.
Jonjo O'Neill's Neptune-bound Taquin De Seuill was the biggest absentee at the latest entry stage.
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