Soulmillion rules out Aga

The successful association, dating back to 2002, would end because of a difficult relationship with the 28-year-old Belgian, whose contract would not be renewed, the Agha Khan Studs said in a statement.

"After eight years under contract as the first rider in France, it has been decided as human relations have become difficult and after mutual agreement, that his contract will not be renewed for 2010," read the statement, posted on the Studs' website.

The Aga Khan Studs and Christophe Soumillon, three-times champion jockey in France, enjoyed great success including four Group 1 wins with Dalakhani and five Group 1 wins with the unbeaten Zarkava in 2008.