Arc heavyweight Mossé sheds light on Leading role

Gerald Mosse: The veteran French jockey joins forces with Ballydoyle for the Arc (Getty Images)

Treve and Leading Light have been supplemented for the Prix de l'Arc de Triomphe, both with veteran French Arc winners booked to ride them. Thierry Jarnet finds himself back on board Treve, whom he partnered to her first three wins, after the latest twist in Frankie Dettori's misfortunes; Joseph O'Brien's battle with the scales – in this case, the weight-for-age scale – has let Gérald Mossé link up with Leading Light at Longchamp on Sunday.

With O'Brien unable to get down to the 8st 11lb the St Leger winner is set to carry, Mossé has stepped forward, as Dettori did last year in his ill-starred association with Camelot. Mossé, who won the 1990 Arc on Saumarez, explained: "I put my services forward for the ride some time ago when I learnt that my intended mount, Chicquita, was to be sold by her owner and would not be running. I would not have a worry about the ground if it turned soft. Today the ground was just on the soft side of good but we are expecting rain tonight. The horse looks extremely strong and solid and that is just what you need to win an Arc."

With Camelot missing this year's race, trainer Aidan O'Brien's only other runner is the Derby winner Ruler Of The World, who will again be ridden by Ryan Moore.

The Fugue has been left in the Arc by John Gosden and not declared for the Prix de l'Opéra on the same card. Her participation hinges on the ground not deteriorating too much, although Gosden hinted at his thinking when his unbeaten 2,000 Guineas favourite Kingman was a defector from the Prix Jean-Luc Lagardère at Longchamp. The Dewhurst Stakes at Newmarket a week on Saturday is a next possible target.

Dettori, who broke an ankle in a fall on Wednesday, is resigned to sitting matters out a little longer, until the new year. "It's too early to say when he'll be back, but I imagine he'll be aiming for the Dubai Carnival," said his agent, Ray Cochrane.

Famous cups go on display

For the first time in nearly 60 years, four of the world's oldest and most famous sporting trophies – the FA Cup, the Ashes urn, rugby league's Challenge Cup and union's Calcutta Cup – will be on display at a special one-day exhibition at Ascot on Champions Day on 19 October.