Buveur D'Air heads seven entries for Saturday's Betfred "Supports Jack Berry House" Contenders Hurdle at Sandown.
Nicky Henderson's charge claimed the Listed prize last season before going on to secure Champion Hurdle glory at the Cheltenham Festival.
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The JP McManus-owned seven-year-old has looked as good as ever in winning the Fighting Fifth at Newcastle and the Christmas Hurdle at Kempton so far this season and will be long odds-on to complete his preparations for a Champion Hurdle defence with another victory this weekend.
Henderson has also entered Call Me Lord, who was an impressive winner of a handicap over the course and distance earlier this month, as well as the veteran Cool Macavity.
Last year's Triumph Hurdle hero Defi Du Seuil is a second entry for McManus, although he appears bound for Leopardstown and a tilt at Saturday's BHP Insurance Irish Champion Hurdle.
The seven-year-old was a revelation in picking up two big hurdling prizes in the summer and was not disgraced with conditions against him when fourth to My Tent Or Yours in the International Hurdle at Cheltenham last month.
Williams said: "John Constable is well and the plan is to run him in the Listed race at Sandown.
"If it gets called off or goes heavy, we will look at the Morebattle at Kelso (February 15), but I would say he will end up at Sandown on Saturday.
"The horse ran really well at Cheltenham on that soft ground and in that grade. If he runs well on his next start, he will come back to Cheltenham for the Champion Hurdle.
"He is a different horse on that spring ground."
Pingshou, who won a Grade One at Aintree last spring, could belatedly make his seasonal reappearance for Colin Tizzard.
Claire Dyson's Cap'N would be a huge outsider and completes the potential field.
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