Van Niekerk broke her ankle after slipping and falling at her new home in Gqeberha in January, which ruled her out of the ODI World Cup. She returned to training in May but has not regained full fitness yet. She last played competitive cricket at the WBBL in November 2021.
Klaas, who has linked up with the squad in England after an injury, will complete a full-strength pace attack, which also has Kapp, Shabnim Ismail, Ayabonga Khaka, Tumi Sekhukhune and Nadine de Klerk.
Women’s cricket will make its debut at the Commonwealth Games in Birmingham later this month. South Africa are grouped with New Zealand, England and Sri Lanka. Two teams from each group will progress to the semi-finals.