Tottenham were the victims of attempted transfer fraud when a Croatian middleman tried falsely to sell the club Holland Under-21 striker Luc Castaignos.
The fraudster contacted Spurs claiming FC Twente had agreed to sell the talented youngster and that he had a document signed by the Dutch club's chairman.
Tottenham subsequently discovered the document to have been forged and UEFA and FIFA have since been notified.
"A player has been offered with this forged document," FC Twente confirmed.
"The forgery has been made known to the KNVB (Dutch Football Federation), with the request to pass it on to Uefa and Fifa and take the appropriate measures."
Gert-Jan Nijweide, FC Twente's finance director, said: "We have recently been informed of this scam from England.
"We have sent a letter to the persons who have used the false document, ordering them to stop immediately."