Frankie Dettori's chances of being reunited with Ruler Of The World in the Arc will be determined after the horse does his final piece of work on Wednesday.

Dettori partnered last year's Derby winner, who is trained by Aidan O'Brien for a group including Al Saqab Racing, to a decisive victory in the Prix Foy earlier this month.

"He's a Derby winner, he's got low mileage this year and he won well last time - I was very impressed," Dettori said.

"The Arc is a very, very difficult race and this year looks a vintage Arc.

"Looking at that list, you could name 10 horses to win this year. It's an unbelievable race."

John Gosden's Oaks and King George winner Taghrooda has been popular this week after pleasing in a gallop at Newmarket on Wednesday and Dettori pointed to the weight-for-age allowance as a major plus for that filly.

"Three-year-old fillies get 11lb (5kg) from the older horses and she's a King George winner getting 11lb - that's why Treve was so spectacular last year," he said.

"It's a great advantage when a filly is good and in good form to run in the Arc. They have a great record."

Dettori missed the winning ride on Treve in last year's Arc after suffering a broken ankle just days before the big race.

He will not be aboard the Al Shaqab-owned filly next Sunday after trainer Criquette Head-Maarek requested Thierry Jarnet be allowed to renew his association.

Treve suffered defeats at Longchamp and Ascot in the hands of Dettori earlier this year and was beaten into fourth in the Prix Vermeille when ridden by Jarnet earlier this month.

"She's not the same horse basically," Dettori said.

"She's moving poorly and she's not striding out at all. Last year she used to pick up, but I think it's becoming a bit of a mental issue now. It's the third time she's run so poorly.

"To try to get her back as good as last year is going to be very hard I think."