Michael Whitaker, who was aiming to win a 13th European Championship medal, has had to withdraw so his nephew William is the only rider in Great Britain's show jumping team.
London 2012 gold medallist Carl Hester heads the dressage team.
Emile Faurie, Gareth Hughes and Spencer Wilton also compete but Charlotte Dujardin, who won two individual golds and team silver to help Britain top the medal table at the last championships in 2015, is not in the team.
Three-time Olympic champion Dujardin is developing a new horse following the retirement of her Olympic horse Valegro.
GB won their first European team gold medal since 2009 at the European Eventing Championships in Poland last week.