The 22-year-old signed for the club in January and was previously with Italian amateur side, Citta Di Pompei until the team disbanded at the end of the 2011/12 season.
The striker made only one appearance in the 2012/13 season and has failed to become a feature in the 2013/14 season.
The club would like to wish Gianluca all the success in the future.
Manager Wayne Burnett said: “We have decided to part ways by mutual consent; both parties felt that opportunities were limited here. I wish him all the very best of success in the future with his football career.”