It has been reported this evening that undefeated dual classic star La Cressonniere has met with a setback and will not run in next Sunday's Group 1 Qatar Prix de l'Arc de Triomphe at Chantilly.

The Jean-Claude Rouget-trained star, winner of both the Poule d'Essai des Poulains (French 1000 Guineas) and Prix de Diane (French Oaks), was one of the ante-post favourites for the race.

She is expected to remain in training as a four-year-old.

Rouget told Press Association Sport: "There is a problem, not a very strong problem but we had to do treatment and that means we cannot run her on Sunday. It's not very important for the future, but enough for her not to run on Sunday.

"We don't know exactly what it is. She has to go to the topography and so on to have it checked it out. The problem is towards the back. It has happened before with Harbinger and Danedream."

Rouget stressed plans for his star colt Almanzor, winner of the Irish Champion Stakes, would not change, and he will still be aimed at the Qipco Champion Stakes at Ascot on October 15.

He said: "Almanzor will not run. He will go to Ascot."