sentences:  He made his debut for South Africa as a substitute in the same game against Australia in Sydney in which his older brother, Jannie, who was in the starting XV, also made his Springboks debut.The Du Plessis brothers became the 23rd set of brothers to earn caps for South Africa at rugby union.Following an illness to Pierre Spies, Bismarck du Plessis was called into South Africa's squad for the 2007 Rugby World Cup; his brother Jannie was a later addition to the squad, replacing B. J. Botha, who injured a knee in South Africa's final pool match against the USA.