Top sire Galileo is reported to be recovering well after undergoing surgery following a bout of colic.
The 10-year-old was struck by the illness at Coolmore Stud on Thursday and was taken to the Fethard Equine Hospital for assessment.
Vets decided an operation was necessary but he is on the mend, according to Coolmore general manager Christy Grassick.
He said: 'We are delighted with his progress and his recovery has been uneventful.
'He is doing very well and we expect him to be returning back to Coolmore very shortly.'
Galileo won both the English and Irish Derbys and King George for Aidan O'Brien during his racing days before bowing out after the 2001 Breeders' Cup Classic.
The Sadler's Wells horse has proved a revelation at stud since, producing the likes of this year's Derby winner New Approach, multiple Group One winner Lush Lashes, St Leger winner Sixties Icon and all-conquering juvenile Teofilo among many high-profile runners.
Galileo is this year's leading sire on the level and has a total of 15 Group One winners to his credit during his breeding career.