The South African Rugby Union (SARU) says it has appointed an independent lawyer to look into allegations of match-fixing in lower-level club games.
SARU said on Thursday (local time) that there had been claims of fixing or attempted fixing in club league matches in South Africa's south western region of Boland.
South African media reported the allegations revolve around referees being instructed to influence matches.
SARU did not give details, other than to say the allegations were serious enough to be investigated. SARU president Oregan Hoskins said no charges had yet been brought against anyone and he gave no timeline for the investigation to be completed.
Rugby has a reputation for integrity and was an amateur sport until the mid-1990s. Cricket and football have more often been connected with match-fixing scandals.