He was a second-half replacement again on Feb. 5 when the Netherlands was beaten 43-0 in Madrid.
Van der Berg arrived in Spain in 2018, and had to live there for three years to qualify for Spain on residency before his debut on Dec. 18. But he reportedly returned to South Africa for four months in 2019, and went back there again during the coronavirus pandemic in 2020.
If Spain is found guilty of breaching Regulation 8, it could lose at least the 10 competition points it won against the Netherlands. That would drop it from second to fourth in European qualifying and out of the Rugby World Cup. Romania, instead, could rise to second and automatic qualification, and Portugal could finish third and advance to the world repechage tournament in November.
It's the second straight Rugby World Cup qualifying that Spain has become embroiled in controversy. In 2018, Spain, Romania and Belgium were sanctioned for fielding ineligible players and Russia advanced to the World Cup in 2019 in Japan.