Ruler Of The World could make his return to action in the Prix Foy as trainer Aidan O'Brien eyes a second crack at the Prix de l'Arc de Triomphe.

Last year's Epsom Derby winner was only seventh to Treve in the Longchamp feature and has not raced since disappointing in the Dubai World Cup at Meydan in March.

A setback meant Ruler Of The World did not run in the Coronation Cup at Epsom but O'Brien said the colt was back to full fitness and the Foy on September 14 was the aim.

"We had him ready to run in the Coronation Cup. We were very happy with him and he just tweaked a muscle in his side so he had a nice break after that, but he's back and has been working away," O'Brien told At The Races.

"He worked nicely the last day he was away. It is very possible he will start in the Foy with a view, if all goes well, of going back to the Arc."

Magician is another of O'Brien's star four-year-olds and his main objective is a repeat of last season's triumph in the Breeders' Cup Turf.

"He's back in full work. He came back from America in good shape," O'Brien said.

"Obviously he's in the Irish Champion and all those races.

"We have one eye on the Breeders' Cup Turf with him and that's where he could finish up at the end of the year."