FIFA have asked Manchester United for information about Paul Pogba's world record transfer from Juventus, following leaks which claimed to give details about the huge deal, a spokesman for the governing body said on Tuesday.
France international Pogba joined United for 89 million pounds ($115.05 million) in August.
Extracts from a book, "The Football Leaks: The Dirty Business of Football", published in Germany this week, included a breakdown of the fee and were reproduced in media reports on Tuesday.