He just changes onto his left leg, gets lower and goes quicker". After his win at York Kyllachy suffered from some soreness in his leg which was explained by bruising behind his right knee. Although he recovered soundness there was not enough time for him to be trained to full fitness for the Prix de l'Abbaye and his retirement was announced at the end of September. Candy said "It's just a pity that time ran out for the Prix de l'Abbaye. The yard will sorely miss him. Following his three weeks recommended box rest, he is now completely sound, and x-rays of his right knee look good. He will exercise here for ten days, and then go to Cheveley Park Stud". On Kyllachy's retirement, Candy called him the best sprinter he had trained whilst Spencer described the colt as "by far the fastest" he had ridden. Kyllachy was retired from racing to become a breeding stallion at the Cheveley Park Stud in Newmarket. He had considerable success as a sire, with his progeny showing their best form over sprint distances. The best of his offspring have included Sole Power, Krypton Factor (Dubai Golden Shaheen), Dim Sum (Chairman's Sprint Prize), Twilight Son (Haydock Sprint Cup), Arabian Gleam (Challenge Stakes), Tariq (Lennox Stakes), Penitent (Joel Stakes) and Stepper Point (Sapphire Stakes).