its because they allegedly signed gael kakuta, a wonderkid in their youth ranks from lens i think it was, illegally. i think they tapped him up or lured him to chelsea before he was 16 or 18 im dont know the whole story. but it was a shock because no one knew that they had been reported to fifa as the issue had never come up before, unlike paul pogba for man u which has been mentioned before and is being mentioned again in the wake of this.