Jockey Tom Bellamy had been set to attempt to guide the Willie Mullins-trained horse to consecutive victories in Saturday's race.
First reserve Pied Piper will take the place of the 2025 winner, who was taken out of the race following a self certificate for coughing.
Patrick Mullins, who rode Nick Rockett to victory 12 months ago, had already chosen to ride Grangeclare West in the showpiece event.
Another horse from the Mullins stable, I Am Maximus, is the 7-1 favourite for the race.
