Hojlund permanent Napoli move a 'formality'
An obligation to buy clause was included in the deal for Hojlund, but the agreed £38m transfer fee has a condition that means the Italian giants must qualify for the Champions League.
Antonio Conte's side sit third in Serie A and would currently qualify.
Hojlund scored four league goals for United last season, but even though he expressed a strong desire to remain at the club, summer signings Benjamin Sesko, Matheus Cunha and Bryan Mbeumo pushed him down the pecking order.
"There's an option to buy and an obligation to buy if we qualify for the Champions League," Manna added.
"The player considers himself a Napoli player, and the same goes for us. This is extremely important."
