Dutch football finds itself in the middle of a legal storm that could throw the entire Eredivisie season into chaos.
NAC Breda, currently battling relegation, have launched a legal challenge over their heavy 6-0 loss to Go Ahead Eagles back on March 15.
The club discovered that defender Dean James shouldn't have been on the pitch that day.
It turns out James, a Dutch-born full back who started representing Indonesia last year, had actually lost his Dutch nationality in the process.
Under Dutch law, when someone voluntarily takes up citizenship of another country, they automatically give up their Dutch passport.
That meant James needed a work permit to play in the Netherlands – one he didn't have.
The whole saga came to light thanks to a podcast, where pundit Rogier Jacobs spotted the problem and explained why James shouldn't have been playing.
Dutch football finds itself in the middle of a legal storm that could throw the entire Eredivisie season into chaos
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"If you're a Dutch player with Indonesian roots, you can choose to play for Indonesia," Jacobs said, as per ESPN.
"You'll get a passport there, but what a lot of players and clubs don't know is in some cases, you'd therefore give up your Dutch nationality."
Jacobs revealed he'd been chatting with a specialist lawyer at a drinks reception who warned him this could become "a very big deal."
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NAC Breda, currently battling relegation, have launched a legal challenge over their heavy 6-0 loss to Go Ahead Eagles back on March 15
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And he wasn't wrong.
Several Dutch-born players have made similar moves, choosing to represent countries like Cape Verde, Indonesia and Suriname – all of them now requiring work permits to continue playing in the Eredivisie.
Once NAC learned about James's ineligibility, they asked the KNVB to scrap the result and order a replay.
The competition board said no – the result would stand despite acknowledging James shouldn't have played.
So NAC took it to appeal, and their lawyer Tim Wilms made their case in court on Tuesday.
"This case is not about sentiment, but about a simple rule," Wilms told De Telegraaf. "Fielding a player who is not eligible to play. Go Ahead had fielded a player who was not eligible.
Dean James is in the spotlight amid the chaos impacting Dutch football in the Netherlands
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"The standard rule of the KNVB is that a match is then replayed, the reason for the ineligibility does not matter."
Essentially, NAC's argument is straightforward: the KNVB didn't follow its own rulebook. But here's where things get really messy for Dutch football.
KNVB lawyer Michiel van Dijk warned the court that if NAC win their appeal, it could trigger a "snowball effect" across the league.
He confirmed that 11 players at eight different clubs are caught up in the same passport issue, having switched nationalities to play for Cape Verde, Indonesia or Suriname.
That means 133 matches could potentially need replaying – and clubs including Ajax, Feyenoord, Telstar, FC Volendam, Heracles Almelo and TOP Oss have reportedly signalled they'd want their own results overturned too.
"The play-offs are already scheduled, and there are hard deadlines for the European competitions. Extensions are not possible," Van Dijk said. "And finally: matches must be played on the field, not in court."
A ruling is expected on Monday.