Saturday's tour match between the Bulls and British & Irish Lions at Loftus is reportedly in doubt due to Covid-19 cases in the Bulls camp.
The match is set to be the third of the British Lions tour following this past weekend's clash against the Johannesburg-based Lions and Wednesday's fixture against the Sharks at Ellis Park.
According to a report on the SuperSport website, however, claimed that "several" Bulls players had tested positive for the coronavirus on Monday as the squad was due to enter into a five-day bio-bubble ahead of the Lions clash.
The players who tested positive, the report adds, have been placed in isolation.
Also on Monday, the SA Rugby confirmed that lock forward Lood de Jager had tested positive for the virus and the Springboks were forced to suspend training as a result.
Further updates were due to be given following further testing within the squad an consultation with the Medical Advisory Group (MAG).
The Boks were due to name their match-day squad on Tuesday afternoon for Friday's Test against Georgia at Ellis Park, but that has also been postponed.
Sport24 contacted members of Bulls management, while a senior communications official confirmed that further updates would be provided in due course.