A Fifa spokesperson said its Transfer Matching System – the online platform that monitors cross-border transfers – was looking at the switch.
A statement revealed: “We can confirm that Fifa TMS has been requesting information on this matter. We have no further comment at this stage.”
Pogba, 24, returned to Old Trafford last August from the Serie A giants in a blaze of publicity.
And French reports claim Fifa have been investigating the deal since September 16.
It is believed they are looking into allegations of third-party ownership, which is banned in England.
Fifa are likely to ask for for clarification over who was involved and which individuals were paid for their part.
Most read in football
DONE DEAL
Man United boss Jose Mourinho makes Espanyol's Arnau Puigmal his first summer signing
OUT OF THIS WORLD
David Luiz splashes out £1.1m on luxury bracelets for Chelsea team-mates to celebrate winning title… and gift for Abramovic is made from FIVE BILLION-year-old meteorite
german off-icieny
Bibiana Steinhaus will become Bundesliga's first female referee — and she's Howard Webb's girlfriend
ALL WHITE FOR SOME
Manchester United train ahead of their final Premier League match... but has Paul Pogba forgotten his boots?
'NOT A COACH'
Arsene Wenger can't coach his way out of a paper bag and Arsenal blocked my return FOUR times, says Tony Adams
WAYNING POWERS
Jose Mourinho reveals Wayne Rooney faces 'very difficult' situation as he comes to 'last part of career'
Yoko oh yes
Chelsea to ramp up bid to land Tiemoue Bakayoko for £43m and could throw in Michy Batshuayi to seal deal
KYL-ER BLOW
Liverpool have £64m bid for Monaco star Kylian Mbappe turned down, according to bizarre rumour
Zoum off to France
Chelsea defender Kurt Zouma set for season-long loan spell with Marseille ready to make move
Ajax to grind
Jose Mourinho says Ajax should not be in Europa League because they played Champions League
JOSE'S JUNIORS
Jose Mourinho set to name TEN Man Utd kids in his squad for final Prem game of season against Palace
NO WAY JOSE
Antoine Griezmann will STAY at Atletico Madrid and snub Man United as he 'loves Diego Simeone'
MANC MESSI
Meet Angel Gomes... the Manchester United wonderkid being compared to Barcelona great
Talisman
Antonio Conte promises to build Chelsea team around Eden Hazard if Belgian signs new £300k-a-week deal
AND HE'S WON IT
Ander Herrera bags player of the year award at Man United's lavish end of season bash hosted by Rachel Riley
FRANCKS FOR EVERYTHING!
Bayern Munich to let Franck Ribery return to Marseille this summer after decade of service
Blues in Aub-it
Chelsea want Borussia Dortmund's 37-goal hero Pierre-Emerick Aubameyang to replace Diego Costa
PITCH BATTLE
Hull groundsmen to take club to court for wrongful dismissal after being sacked 'over state of pitch'
Dier Straits
Tottenham shaken as Eric Dier wants to leave along with Kyle Walker and Danny Rose... as both Manchester clubs prepare to swoop for Spurs stars
TAM'S THE MAN
Everton to use Tammy Abraham as leverage in any deal to take Romelu Lukaku back to Chelsea
Raiola refused to comment but United chiefs are understood to be relaxed about the investigation.
A club spokesman said: “We don’t comment on contracts. Fifa have had the documents since the transfer in August.”
And if the club is found to have provided inaccurate information in transfer papers, the most they or Juventus can be fined is a measly £11,750.
A larger fine could be implemented if third-party influence is found – with the case then likely to be refereed to Fifa’s Disciplinary Committee.
Fifa banned all third party ownership of players’ economic rights in 2015.
This year, Dutch club Twente were fined £135k and Sevilla £42k for breaching new rules.
Leave a comment