William Buick© Photo Healy Racing
William Buick will partner Ivanhowe in the Prix de l'Arc de Triomphe at Longchamp on Sunday.
Trainer Jean-Pierre Carvalho and owners Gestut Schlenderhan had been considering their options for some time, and have now swooped for the star British rider.
Germany's big hope is a significant player in Europe's premier race after he defeated Sea The Moon by three lengths in the Group One Grosser Preis von Baden on September 7.
Carvalho said: "I'm very happy to get William Buick. He's a very good jockey. He's very strong.
"I know William and I know his father (Walter), who rode in Germany before. It was a very good decision.
"We had four or five jockeys in mind for the Arc and we had the choice of William Buick or Ryan Moore, but Ryan Moore, I think, may be riding for Aidan O'Brien."
