The Chilean international scored 19 times in La Liga this season, but was left out of the majority of the big matches.
A number of clubs have been linked with a move and now Marotta has confirmed that the Italian champions are interested in his services.
"We're looking for a versatile player who can operate in several positions," Marotta told Sky Sport Italia.
"We are looking for a quick wide attacker. We would like to have a player like Sanchez but there aren't many players like him at the moment.
"And we shouldn't forget that Barcelona made a big investment to get him. But I repeat, he's a player we would like to have."
Sanchez moved from Udinese to Barcelona in 2011.