West Brom have denied any wrongdoing in their signing of Argentina midfielder Claudio Yacob.
A report has accused the Baggies of breaking regulations by using two unlicensed agents, Daniel Villagran and Oscar Bianco, during the course of completing the transfer last summer.
Villagran and Bianco claim they have not been paid for their alleged part in the deal that saw Yacob move to the Hawthorns on a free transfer from Racing Club in July 2012.
A breach of the rules governing unlicensed agents can be punished through fines or even points deductions, but West Brom insist they have done nothing wrong.
A club statement said: "As with all of our transfer dealings, the negotiation process regarding the signing of Claudio Yacob complied fully with all FIFA and FA rules and regulations.
"All negotiations were conducted and concluded directly with a FIFA-registered agent."