Trainer Peter Casey has confirmed Flemenstar will not be returning to his County Meath yard this season.
The eight-year-old struck eight times in 12 starts for Casey and enjoyed a meteoric rise during the 2011-12 season.
He won two Grade One events before adding to his haul at the highest level when claiming the John Durkan Chase last December.
However, he suffered a couple of surprise reverses when only third in the Lexus Chase and second in the Irish Hennessy earlier this year and signed off for Casey with a well-beaten third behind Sprinter Sacre in the Melling Chase at Aintree in April.
Casey said: "He's not coming back. It is disappointing news."
The eight-year-old struck eight times in 12 starts for Casey and enjoyed a meteoric rise during the 2011-12 season.
He won two Grade One events before adding to his haul at the highest level when claiming the John Durkan Chase last December.
However, he suffered a couple of surprise reverses when only third in the Lexus Chase and second in the Irish Hennessy earlier this year and signed off for Casey with a well-beaten third behind Sprinter Sacre in the Melling Chase at Aintree in April.
Casey said: "He's not coming back. It is disappointing news."