LA LIGA president Javier Tebas has issued a stern warning to Barcelona over the potential sale of Frenkie de Jong.
The Catalan giants reportedly offered De Jong an ultimatum earlier this week.
Club officials told him he would have to take a pay cut if he wanted to stay at Camp Nou, otherwise he had to leave this summer.
However, Tebas has now suggested this would be ethically unacceptable.
The La Liga chief said: “Players cannot be separated from the team or put under pressure – that’s what the collective agreement, the law, reason, ethics mark.”
“From there, Barcelona know the rules and the responsibilities.”
Barcelona already owe De Jong £17m in unpaid wages after agreeing to defer his salary payment during the pandemic.
The midfielder has already made it clear he wants to stay at Camp Nou this summer, despite being heavily linked with a move to Manchester United.
But the club could save around £34million if sold.
Despite owing his current squad millions in backdated wages, Barca have continued to spend big on the transfer market.
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The club have spent nearly £100m to bring Raphinha and Robert Lewandowski to Spain.
And they are expected to spend at least £55m more when they try to sign Jules Kounde from Sevilla.
Many people were shocked by the club’s actions, including Man Utd legend Gary Neville who suggested legal action should be taken.
He tweeted: “De Jong should consider legal action against Barcelona and all players should be behind him!
“A club that spends fortunes on new players while failing to fully pay those it has under contract is immoral and constitutes an offence.
“@FIFPRO should be all over bullying like this and stop it.”