With Carlos Tevez and Fernando Llorente arriving in Turin this summer, speculation has linked Matri with a return to Milan.
"Matri is currently our player; Milan have never asked us about him," Sky Italia quotes Marotta as saying.
"This group can give coach Conte the possibility of technical flexibility. Each one can have a different role. We are okay in this way.
"Clearly, having six strikers, there is not space for all of them. If someone should ask us to go elsewhere we would be sorry, but we will do what we do."
Matri has scored 27 Serie A goals since joining Juve in 2011.