Former Manchester United captain, Gary Neville, has urged Barcelona midfielder Frenkie De Jong to take the club to court.
De Jong has been heavily linked with a transfer to United all summer.
It is believed United have struck a £71.5 million agreement with Barca but issues surrounding a sum of £17m in deferred wages and bonuses owed to the player have stalled any move.
Neville has advised De Jong to seek legal action, with the Catalans splashing out big money on Robert Lewandowski and Raphinha so far.
He tweeted: “De Jong should consider legal action v Barcelona and all players should be behind him!
“A club spending fortunes on new players whilst not paying the ones they have under contract their full money is immoral and a breach. @FIFPRO should be all over bullying like this and stop it.”