But since then, it has been suggested Pogba has decided to remain at Old Trafford and sign a new deal at the club.
His existing contract expires in the summer and, having recently come on as a substitute in United's 2-0 win over West Brom, some sections of the home support booed the 18-year-old.
Pogba's future remains in doubt, however, and Marotta says he will do all he can to get the Frenchman to move to Turin.
Marotta told Tuttosport: "I am optimistic regarding Pogba.
"I know that Manchester United are trying everything to keep him there but he has a bright future if he finally comes to Turin."