Paddy Power's Italian office has already paid out of the deal happening while he has been slashed to 1/6 to join the Serie A champions with British bookmakers.
Paddy Power offered a similar pre-emptive deal on Carlos Tevez joining the club which proved to be correct.
It’s not the first time they have been linked with Nani, as this story has emerged on and off throughout the summer.
Manchester United are thought to want at least €13m for the 26-year-old, who has been at Old Trafford for six years.
Juventus tried to sign Nani two seasons ago and coach Antonio Conte is a know admirer of the player.
Meanwhile, Juventus have officially loaned 20-year-old Ghana striker Boakye to Spanish club Elche.
The announcement came on Elche’s website, confirming the loan with a contract worth €250,000.