London 2012 gold medallist Scott Brash is ruled out of Rio 2016 after his top two rides pick up injuries.
British dressage rider Carl Hester will keep Uthopia in his yard following a dispute over the horse's ownership.
Reigning Olympic silver medallist Zara Tindall has been left out of Great Britain's eventing squad for the 2016 Rio Olympics.
How a chance meeting over a horse has led one Irish rider to get within touching distance of a place at the 2016 Olympics.
Audio & Video
BBC Sport continues the countdown to the 2016 Rio Olympic Games with the moment Great Britain win their first ever gold in the team dressage competition at London 2012.