No snow is forecast ahead of the meeting and he added: "It's perfectly raceable and I would describe the ground as good. I'm confident at the moment, although the forecasts have been volatile," Clifford added.
Kauto Star is rated as evens favourite, with Long Run rated his nearest challenger at about 5-1. They are the only two horses among 24 declarations who are at single-figure prices.
Long Run, an impressive winner of the Feltham Novices' Chase at Kempton on Boxing Day in 2009, will be ridden by amateur Sam Waley-Cohen.
Sam's father Robert, who owns the horse, indicated the ground conditions should be acceptable.
He said: "Our preference is for it to be softer, but we'll take what it is. We don't want to see firm in the going description, but good is good."
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