Ian "Gianni" Cassaro Usart (born 10 April 1992) is a Spanish professional footballer who currently plays as a goalkeeper for Hong Kong Premier League club Eastern.
Cassaro was born in Lloret de Mar, Girona, Catalonia, to an Italian father, and made his senior debut with hometown side CF Lloret in Primera Catalana in 2011. On 5 August 2014, he moved straight to Segunda División B after signing for UE Olot, but spent the campaign as a backup option.
On 19 June 2015, Cassaro was loaned to Tercera División side CE Europa, for one year. On 22 July 2016, he moved to Girona FC, being a third-choice of the main squad while playing for farm team CF Peralada in the third division.
On 1 June 2018, Cassaro agreed to a deal with CF Talavera de la Reina, still in the third division. On 26 June of the following year, after being a regular starter, he moved to fellow league team UCAM Murcia CF, but was only a second-choice behind Julio Iricibar.
On 20 August 2020, Cassaro signed for Yeclano Deportivo also in the division three, being an undisputed starter as his side suffered relegation. On 25 August 2021, he joined Villarreal CF's reserves in Primera Federación; an initial third-choice option to Iker ÃÂlvarez and Filip Jörgensen, he contributed with seven appearances during the campaign as his side achieved promotion to Segunda División.
On 22 June 2022, Cassaro renewed his contract with the Yellow Submarine for a further year. He made his professional debut at the age of 30 on 17 September, starting in a 3âÂÂ1 home win over CD Lugo.
In July 2024, Cassaro joined Segunda Federación club CE Sabadell FC.
On 16 January 2026, Cassaro joined Hong Kong Premier League club Eastern.