Trainer Criquette Head-Maarek is not taking the opposition lightly but says Treve is ready to fire in the Prix Vermeille at Longchamp.

The dual Prix de l'Arc de Triomphe winner has had a perfect season to date, winning twice at Saint-Cloud, including a comfortable defeat of the classy Flintshire last time out.

Her whole season has been built around an attempt to become the first horse to win Europe's premier race three times and while everything went wrong before the defence of her crown last year, this season it has all gone to plan.

While Sunday is billed as Arc Trials day, the Vermeille is a Group One in its own right.

Arabian Queen, the only horse to beat Golden Horn, will be in opposition as well as Aidan O'Brien's Pretty Polly winner Diamondsandrubies and Francois Doumen's Sea Calisi, who finished third in the Yorkshire Oaks.

"Of course I am looking forward to it. Whenever she runs it is a big deal," Head-Maarek said.

"But this is definitely not a trial, the Vermeille is a very important Group One in its own right.

"She's in great form, she did her final piece of work earlier this week and everything was good."

When asked if Treve was anywhere near her best form for this weekend with the Arc on the horizon, Head-Maarek said: "She's 100 per cent for this because she'll need to be 200 per cent for the Arc!