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."
13 May 2013
Fabre confirms Ocovango for EpsomAspect on route to big things
Room at the top for Cityscape
Freedom steps into chasing ranks
Lucky thirteen in line for Lockinge
Galway beckons for Swinton hero
Sajjhaa set for late return
Cadeaux thriving in Singapore
Pink primed for Duke Of York
Liber takes aim at Musidora
Battle won for O'Brien
Pretending the real deal
Duntle back to winning ways
Classic glory for Flotilla
Style wins the day in Paris
Highclere double-handed for Dante
Cornerstone plans up in the air
Beckett planning Gesture workout
12 May 2013
No hurry for Jammy plansGuest in hunt for more Ascot glory
Vow set for Goodwood return
Gold-en boy Anodin in Classic hunt
Buick aiming for French strike
Angel flies home to land Chartwell
Barizan bounces back in style
Queally lights up Ascot meeting
Ektihaam storms to Buckhounds win
Nevis takes depleted Trial contest
Hard-fought battle won at Haydock
Secret impresses in Oaks Trial
Ascot drama for Fanning
11 May 2013
Felix foot-perfect on fencing debutCavalryman leads Cup charge
Ramsa ready to stand Trial
Duntle out to dazzle in Amethyst
Swift return doesn't bother Moran
Garman gives Bolger hope
Henderson: Ground vital for Voice
McMahon sweet on Tart Ascot claims
Murphy to move to France
Athos flies to Ormonde glory
Dee day for impressive Magician
Kingdom confirmed for Queen Anne
Secret's out for Lingfield glory
Lambe expects good run from Hall
Marengo ready to do battle
Greatwood on trial at Lingfield
Barizan sneaks into Swinton
Jamesie gunning for Vic-tory
10 May 2013
Telescope focus is on DanteBlinkers considered for Guarantee#
Bonfire camp bemoan Huxley flop
Moohaajim has six appeal
Ascot welcomes a couple of Guests