Vucinic was presented to the Press today following his 15m move from Roma.
"Vucinic is an element who raises the quality level at Juventus. Both the club and Coach Antonio Conte are satisfied," said Marotta.
"Mirko is an excellent player and 15m is far inferior to the sum paid in other transfers. The valuation of players like Alexis Sanchez, Javier Pastore and Sergio Aguero is beyond all logic and against the concept of financial fair play.
"Then again, all clubs are free to move the way they see fit."