Geraghty yet to choose
(Healy Racing Photos)
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."
As speculation continues about the depth of Flemenstar's stamina, his year older full-brother Barafundle will bid to again show the staying-power of the family when he contests the three mile Blue Square Bet Handicap Hurdle at Haydock today.