The former Palermo man looked to have hit the ground running after a solid start to the current campaign.
He scored 10 goals in six league appearances for the Old Lady but has since struggled in front of goal.
Dybala has yet to score in the Champions League and has now netted just once since September 23 in domestic competitions.
Despite his dip in form, Marotta has urged the fans to get off his back.
He told Sky Sport Italia: "There’s a lot of pressure on him at the moment.
"We’ve got used to him giving extraordinary performances. Therefore, when he puts in an ordinary performance, it’s branded inadequate.
"In reality, he’s a player who only turns 24 years on November 15. Therefore, we have to let him mature so that he becomes a champion.
"When you’re young, there are times when your performances aren’t at their best."