European politician Derk Jan Eppink wants to open an investigation to determine how Real Madrid afforded to sign Gareth Bale from Tottenham.
According to Spanish newspaper AS, Eppink plans to ask the European Commission to investigate the deal between Spurs and Madrid.
He believes the transfer was partly funded by Bankia - a nationalised bank in Spain. Bankia was bailed out by the European Union during the financial crisis - the institution received €19bn in recapitalization funds.
Eppink, a member of the List Dedecker party, has confirmed he intends to send a letter to the Commission outlining his concerns with the deal.
The Belgian MEP has hit out at Madrid for funding the Bale transfer through debt. According to Eppink "they [Real Madrid] have accumulated a debt of some €600m, financed to a large degree by Caja Madrid."
Caja Madrid is a savings bank that is now part of Bankia.
Eppink continued: "It [Bankia] was recently rescued by the European Stability Mechanism [ESM], requiring an injection of no less than €18bn and yet now they offer support in the transaction conducted by Real Madrid.
"European Union funds cannot be used for such unsustainable practices."
The European Commission already plans to look into the financial stability of several La Liga clubs - including Real Madrid, Barcelona, Osasuna and Athletic Bilabao.
Tottenham reportedly received close to £85m for Bale from Real Madrid - a world record fee.