The Argentina international looks set to leave City in January after allegedly refusing to appear as a substitute against Bayern Munich last month.
Tevez has been linked in recent months with a move to Serie A, with Juve and Inter Milan among the clubs reportedly keen to acquire the 27-year-old's services, but Marotta on Wednesday played down any link with his club.
"It's normal to talk about players when it comes to Juventus," said Marotta to Gazzetta dello Sport. "But we have not started negotiations to sign Tevez.
"We have a squad that meets our needs and we will evaluate week by week if we are lacking something.
"We are not the ones to discover Tevez.
"He is a great player and we are a great club so it's normal that there is a link, but to say that we are negotiating is a different matter."
Tevez is under contract with City until June 2014.