The Football Association has confirmed that it will investigate evidence sent to it regarding Blackburn's signing of defender Gael Givet.
The FA will look at the evidence before deciding whether to pursue the matter.
FA regulations state that licenced agents are the only third party allowed to be paid for a transfer.
"We will be looking into the material and the issues that may be raised by the content," said an FA spokesman.
Givet, who has won 13 caps for France, joined Blackburn from French side Marseille initially on loan in January 2009 before signing a permanent deal that summer.
Since his permanent switch, he has made 69 appearances for Rovers, scoring four goals.