Irish showjumpers Billy Twomey and Denis Lynch, and French rider Simon Delestre were all disqualified from the penultimate leg of the Global Champions Tour in Rio de Janeiro on Sunday following hypersensitivity tests on their horses’ legs.

Following tests, which include veterinary examinations and the use of a thermographic camera, all three riders’ horses — Twomey’s Romanov, Lynch’s All Inclusive NRW and Delestre’s Vancouver DML — were deemed unfit to compete.

In a statement the International Equestrian Federation stated that although the horses had been disqualified there was “no indication of malpractice”.