An Irish equestrian has lost his appeal to be selected for the Olympic jumping competition.

The Court of Arbitration for Sport says it rejected Denis Lynch's challenge of Horse Sport Ireland because it had no authority to hear the case.

Irish officials had nominated Cian O'Connor to replace Lynch getting one of two entries in individual jumping. Lynch was originally selected then withdrawn after his horse, Lantinus, was disqualified from a recent event because of health issues.

The competition begins Saturday at Greenwich Park.

O'Connor won the show jumping at the 2004 Athens Olympics but was stripped of his gold medal after his horse tested positive for a banned substance.