Pianelli was a product of the SC Bastia system, where he began playing at age 5, remaining there for his entire youth career, eventually training with the first team, only leaving the club when they began to experience financial difficulties.
[1] In 2019, he moved to Canada to attend the Université du Québec à Trois-Rivières, where he played for the men's soccer team, winning the U Sports men's soccer championship in his first year, where he was named to the all-tournament team.
[5][6] In 2016, he debuted with SC Bastia II in the fifth tier Championnat de France Amateur 2.
[7] He was contacted by neighbouring club AC Ajaccio, but chose to remain with Bastia, whose first team was demoted to the new fifth tier 2017–18 Championnat National 3, taking the place of the reserve side, in order to retain his status as an amateur.
[7] At the 2022 CPL–U Sports Draft, he was selected seventh overall by Forge FC,[9][10] In February, he signed with Forge ahead of their CONCACAF Champions League matches,[11][12] but did not remain with the club afterwards on a CPL contract as their roster was full.