The signing of Paul Pogba by Manchester United last year is the subject of a FIFA investigation.
The investigation into the world-record transfer from Juventus to the Red Devils is to seek clarification on who was involved in the £89.3m transfer, and how much money was paid to them.
Pogba, 24, is in his second spell at Old Trafford, having left the club for Juventus for £1.5m in 2012.
The France midfielder first joined United from French side Le Havre in 2009.
This investigation comes after Newcastle United and West Ham United were raided by HMRC officials a fortnight ago to investigate potential cases of fraud.