The pair were due to make their debuts in the Games when the men’s event starts on Thursday at Kasumigaseki Country Club.
German world number one Isabell Werth and her two team mates topped each of their three groups at the Olympic equestrian dressage qualifiers on Sunday to make Tuesday's team final ahead of Britain and Denmark. Team dressage medals will be awarded on Tuesday and individual dressage medals on Wednesday, with the three countries strong contenders in both. "It's always very important that you have a strong field and that you have strong competitors because then you push each other to top performances," Werth said when asked about the rivalry between Germany and Britain.
The team and individual dressage finals are set to produce thrilling action.
Giles bagged a judo bronze before Sinden struck silver in the taekwondo.