Manchester United have been strongly linked with a move for Chile international Vidal with Louis van Gaal thought to have made the midfielder one of his top summer transfer targets.
Vidal is under contract at Juventus until 2017 and Marotta remains confident the player will stay at the club as he has not indicated he wants to move on.
"We recently renewed his contract because we knew that we could count on an important element," Marotta told Sky Italia. "He has not taken any different position to what he thought before.
"Transfer gossip is normal on one of the best players in circulation. We have never activated a plan to sell the player.
"In football you can never say, but if the player wants to stay we will be happy to keep him."
Marotta also revealed he expects Juventus to tie up a move for Verona midfielder Romulo in the next 24 hours.
"I certainly cannot deny talks with Verona for Romulo," added Marotta. "There are situations that need to be defined, but we can complete the move within 24 hours."