The betting for the Prix de l'Arc de Triomphe could look very different on Sunday evening as a number of Arc aspirants strut their stuff at Longchamp this weekend.

The Group One Prix Vermeille is looking like a potential thriller with three of the first four in the Irish Oaks - Great Heavens, Was and Princess Highway, all set to be involved.

Last year's winner, Galikova, is also in the 15-strong field for Freddie Head along with a number of other interesting French fillies.

Japanese Triple Crown winner Orfevre makes his first start in Europe in the Prix Foy, but faces a formidable opponent in Meandre.

Andre Fabre’s representative could only finish sixth in last year's Arc but has already won two Group Ones this season.

Michael Stoute's Fiorente is among the eight horses going forward along with O'Brien pair Treasure Beach and Robin Hood, plus the ex-Aidan O'Brien and now Marco Botti runner Joshua Tree, who was beaten by Fiorente at Newmarket in July.

Fabre could try the lightly-raced Last Train in the three-year-old trial, the Prix Niel.

However, he faces the likes of Aga Khan duo Bayrir and Kesampour plus Godolphin's Mandaean.

O'Brien has left in Imperial Monarch, possibly bound for other targets, with David Lanigan leaving the option open for Main Sequence if he does not run in the Ladbrokes St Leger.

There are, as usual, plenty of British sprinters in the five-furlong Prix du Petit Couvert.

Definightly, Monsieur Joe, Inxile, Spirit Quartz, Stepper Point, Ballesteros and Duchess Dora could all travel over.

Excelebration and Farhh are set to clash in a hot renewal of the Prix du Moulin.

The pair would both have considerably more Group One victories to their name if it were not for the existence of Frankel, but for once Henry Cecil's champion is not among the field.

Excelebration won the race last year when with Botti, and after a couple more defeats to Frankel, new trainer O'Brien saddled him to land a very competitive Prix Jacques Le Marois at Deauville.

Godolphin's Farhh, no match for Frankel at Goodwood and York, drops back to a mile again but there is further stiff competition among the eight horses confirmed for the weekend.

Stunning sprinter Moonlight Cloud, fourth in the Marois, has another try at the distance, with Brian Meehan's Most Improved and Alan McCabe's Caspar Netscher other possibles.