Antonietti made his National League A debut playing with Genève-Servette HC during the 2009–10 NLA season.

At the end of the season, Lausanne decided not to offer him any contract extension, allowing him to agree to a one-year deal with the Dragons de Rouen of the French Ligue Magnus.

This allowed him to join back Lausanne HC and played his first game of the season on 6 January 2018 against EHC Kloten, failing to score a single point.

On 19 April 2018 Antonietti agreed to a two-year contract extension with Lausanne HC worth CHF 900,000.

On 3 February 2021 it was announced that Antonietti would return to Genève-Servette for the 2021–22 season, joining the team on a two-year deal.