Flemenstar has been ruled out of the Boylesports.com Champion Chase at the Punchestown on Tuesday after connections decided to give the eight-year-old a wind operation.
Peter Casey's gelding looked set to take the season by storm after winning his first two starts of the campaign in impressive fashion, but things have not gone to plan since.
Flemenstar was narrowly beaten on his first attempt at three miles in the Lexus Chase at Leopardstown over Christmas, before chasing home Sir Des Champs in the Hennessy Gold Cup in February.
He missed the Cheltenham Festival after it was discovered he was suffering from a lung infection and although he returned to action at Aintree, he appeared below-par in finishing a distant third in the Melling Chase behind Sprinter Sacre.
Casey said: "He won't be running in Punchestown.
"When he came home from Liverpool, he was all wrong. He had stuff coming out of his nose, it wasn't blood but it was a bit like it, and the vet came to see him every day for a week.
"He didn't run his race at all in Liverpool. That's as bad as I've ever seen him run.
"He's going to have a little wind operation now. The jockey (Andrew Lynch) thinks he needs it and now is the right time to do it.
"Hopefully the everything will be right for next season, it will be the same routine, and the next time you'll see him will probably be at Navan in November (Fortria Chase)."