David Bridgwater could turn to Tony McCoy for The Giant Bolster in the William Hill King George VI Chase at Kempton on Boxing Day.
Runner-up in the Cheltenham Gold Cup, the seven-year-old made a satisfactory return to action when third to Silviniaco Conti in the Betfair Chase at Haydock last month.
He was ridden on Merseyside by Tom Scudamore, who has been on board for eight of the gelding's last nine starts but would be required to ride Grands Crus for David Pipe should he take his chance.
Bridgwater said: "He's Tom's ride, but if Grands Crus runs he has to ride that, end of story. It's all up in the air, but I've been talking to (agent) Dave Roberts over the possibility of AP McCoy being free."
Barry Geraghty has yet to make a decision on whether he will partner Finian's Rainbow or Riverside Theatre.
Finian's Rainbow won the Queen Mother Champion Chase at last season's Cheltenham Festival, but struggled in heavy ground on his reappearance at Ascot in November.
Riverside Theatre, who finished second to Long Run in the King George two seasons ago, landed the Ryanair Chase at the Festival in March but has not been seen since he was pulled up at Aintree in April.
The Irish jockey told At The Races: "It's a very difficult call - you don't want to be offending anyone, either.
"Both were good winners at the Festival and I think both would get the trip. It's a very difficult one and we'll let it run to the wire."
27 May 2015Treve stars in Corrida field
Epsom forecast as Thunder aim
Tac team happy to bide time
Raydara in season during Guineas
Life's a Beach for Levins
Ervedya given Royal approval
Haggas on War footing for Ascot
Oaks trip to suit Legatissimo
Coronation up Dolniya's street
Ribbons may cut a dash to Curragh
Gosden duo at ease for Brigadier
Derby duo gives Gosden glee
Found remains in Derby hat
Park satisfies in Epsom spin
26 May 2015Double sets welcome mark for Gask
Rain would boost Sand Ascot dream
Karaktar on track for French Derby
Punters' Pal Set For Musselburgh
Simenon bids for Henry II rule
Angel of the north has Royal aim
Treve delights Head-Maarek
Epicuris heads to Epsom
Fire lit up for Redcar gold run
Park set for Epsom 'sighter'
Karpino oozes class in Cologne
Limato set for Haydock weekend run
Moviesta pleases in Curragh spin
Leisure date for Lucky
Prince to step up
Cirrus likely to bypass Epsom
Ascot option for Devonshire
25 May 2015Limato set for Haydock weekend run
French ace Chop in line for Ascot
Pretty target for Tamadhor
Prolific Robin in foal
Ramone delights Farrell
Moore set for Shamal ride
O'Brien still has Derby puzzle
Air Force has lift-off on debut
Guineas glory for Pleascach
More Curragh Gold for Kazeem
Curvy holds off Canaletto
Super Solow takes Longchamp prize
Varian pleased by Belardo effort
Dirty scope blamed for Byron run
Ascot test for Time
24 May 2015Full steam ahead for Mast return
Mustajeeb sprints to it
Pearl's a sprint jewel for Barron
Tate springs Listed surprise
First Ascot chance for Crisford
Glen best miler we've had - O'Brien
Exciting options for Simcock ace
Muta grabs Bowl with late charge
No decision on replacement - McCoy
Harrington bids for Guineas glory