The International Equestrian Federation (FEI) has categorically denied rumours that German show jumpers Ludger Beerbaum and his American-born sister-in-law Meredith Michaels-Beerbaum are being investigated for a doping incident at the Olympics.

FEI spokesman Malina Gueorguiev said: “We have said that the case of Rodrigo Pessoa was the final to be investigated from the Olympics and that is the case. We are not investigating the Beerbaums.”

There have been six cases of alleged doping of horses at the Olympics in Hong Kong — show jumpers Bernardo Alves of Brazil and Chupa Chup and his team mate Rodrigo Pessoa and Rufus, Christian Ahlmann of Germany and Cöster, Denis Lynch of Ireland and Lantinus and Norway’s Tony Andre Hansen and Camiro and American dressage rider Courtney King and Mythilus.

Rumours had abounded that the FEI was to announce two more cases today but Ms Gueorguiev had denied those suggestions.