Born in
Nova Iguaçu,
Rio de Janeiro, Gustavo Apis joined hometown side
Nova Iguaçu FC at the age of seven. He made his senior debut on 6 May 2018, coming on as a late
substitute in a 1–4
Série D away loss against
Caxias. Gustavo Apis scored his first senior goal on 27 May 2018, netting the opener in a 2–0 home win over
Mirassol. On 25 February 2021, he moved to
Fluminense on loan, and was initially assigned to the under-23 squad. Gustavo Apis made his
Flu – and
Série A – debut on 10 July 2021, replacing
Paulo Henrique Ganso late into a 2–1 away success over
Sport Recife. On 3 September, he signed a permanent deal with the club until 2025. ==Career statistics==