FIFA's general secretary Jerome Valcke has revealed that an investigation into 15 English transfers could take years to complete - but that none are as serious as the case which led to a transfer ban on Chelsea.
The London club were found guilty of inducing French teenager Gael Kakuta to break his contract with Lens in 2007 when he was 16 and banned from making signings for two transfer windows. The club are appealing.
FIFA are now looking into 15 other cases from England, with Valcke saying: "Everyone is coming with lawyers, and then it takes years, at least months, to finalise cases."
He added: "The day after (Chelsea) we received a number of letters and calls.
"We have 15 investigations in England and we know already that these investigations are not at the same level as the Chelsea one."
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