The 18-year-old attacker hit the headlines with a stunning double against Sunderland, but will be out of contract next summer – though United are ramping up their efforts to keep the teenager at the club.
|12/1||Adnan Januzaj is 12/1 with BetVictor to be named the PFA Young Player of the Year
"If they fear another case like Pogba's then they are right," Marotta told Tuttosport.
"It's difficult to understand how we can reach a stage eight months prior to the contract expiring without seeing a renewal.
"Januzaj is a player showing big promise. He is a player of great quality."
Januzaj is currently at the centre of an international tug-of-war, while Pogba has helped Antonio Conte's men secure their second successive Scudetto following his move to Turin.