The discrepancy emerged when Romania gave World Rugby a photograph of Van den Berg at a wedding in South Africa in 2019 two weeks before he had supposedly left Spain according to the dates in his passport.
"When they showed me the copy of my passport that Alcobendas Rugby Club had provided to FER [Spain's rugby union], I saw that the dates of the exit stamps from Spain and the entry stamps in South Africa in 2019 did not match with the actual dates of my trip," Van den Berg explained in a declaration.
As a result of Van den Berg playing for Spain despite being ineligible, Spain were deducted 10 points by World Rugby dropping them down to fourth in the Rugby Europe Championship, losing their automatic qualification slot for the 2023 Rugby World Cup to Romania. Portugal have also moved above Spain into the repechage qualification spot, with Spain missing out on a first men's World Cup appearance since 1999.
Spain were also forced to pay a £75,000 (NZ$144,493) fine, £50,000 of which had been suspended from 2018 when Spain were deducted points for another ineligibility breach after qualifying for the 2019 Rugby World Cup, where their spot was taken by Russia.
Van den Berg has not been punished as a result by World Rugby, but Spain have been found to be at fault for "not putting in place certain appropriate systems and in not properly implementing other systems which had been put in place" ahead of selecting Van den Berg.
"The machinations then revealed over the apparent tampering with, and (ab)use of, the copy of the Player's passport are quite despicable and reflect very badly on those that may have played a part in such events," World Rugby's statement on the matter read.
Alcobendas have since removed the officials allegedly involved from their positions but the Spanish Cup final between the club and El Salvador set to be played in Seville has been postponed, with Alcobendas also facing possible relegation.