Antonietti made his National League debut playing with Genève-Servette HC during the 2010-11 season.

He sustained a lower-body injury in November 2017 and was put on the trade block by Geneva in order to get rid of his remaining CHF 650K salary.

Antonietti began the 2019–20 season as a healthy scratch with Geneva before being loaned to the SC Rapperswil-Jona Lakers on October 9, 2019.

On June 15, 2020, Antonietti was offered a professional try-out contract by HC Lugano to attend training camp in August 2020.

[3] He was immediately loaned to Lugano's affiliate, the Ticino Rockets, to play preseason games.