Two riders have been provisionally suspended by the International Equestrian Federation (FEI) after their horses tested positive for banned substances.
British jumping athlete Henry Turrell has been suspended after his horse Blaze of Glory II recorded an adverse analytical finding at an event held in Vialmoura in Portugal between March 6 and 12.
His horse failed for sparteine.
Also suspended is South African jumper Jeanne Engela.
Her horse Chanel Van De Zeshoek failed for paracetemol in Polokwane in South Africa at a competition held between August 31 and September 4 last year.
The provisional suspensions of both athletes began on April 18 when they were each informed.
Both horses involved have also been suspended for two months.
Sparteine and paracetemol are both outlawed under the FEI's Equine Anti-Doping and Controlled Medication Regulations.
The bans follow six athletes receiving provisional suspensions from the FEI for alleged doping offences earlier this month.