Though the 10-year-old gelding is sound, following X-rays the Chantilly handler felt it was not worth the risk putting the horse under maximum pressure in a race.
“He has been in great condition and very well, but I found that in his work for racing he was holding himself back a little so we checked his legs,” she said.
“We couldn’t see anything so we took X-rays and found a little calcification in a ligament that could be dangerous if he put in 100 per cent. In a race, it could break.
“We decided with the owner not to take such a risk and put the horse in danger, so we have decided to retire him while he is sound and happy.”
She went on: “He doesn’t suffer. He can trot, he can gallop, but we don’t want him to go to his maximum as it would be dangerous.
“He will stay with me for at least two months. We have to wind him down as he was working to go racing.
“He will do something with Christophe Soumillon (jockey) when he retires. He wants to be a part of the horse’s retirement.”
Cirrus Des Aigles won seven Group Ones contests - and 17 Group races in all - among 22 successes in 67 races in six years, earning his connections over £6.1million in prize money.
His constitution and appetite for racing over the years was such that he competed not only in his native France, but also Britain, Ireland, Japan, Dubai and Hong Kong.