Champion Belgian jockey Christophe Soumillon has been sidelined for an unspecified period after a fall at Nancy on Wednesday that left him with a fractured left elbow. Soumillon, 28, who recently lost the position as first rider for the Aga Khan to Christophe Lemaire, was thrown by his mount after she shied at the hedge used as an inside running rail approaching the top of the straight. Soumillon (pictured) was thrown back across the racecourse into the path of other runners and was clipped by another horse trailing behind the field. The jockey could not be removed from the track for 45 minutes while ambulance officers attended to him, and was then taken to a hospital where he underwent surgery. Soumillon is expected to miss next month's Prix de l'Arc de Triomphe and may be out for considerably longer. He is due in Hong Kong for the International Races in December.