Born in Itu, São Paulo, Ronaldo joined Flamengo's youth setup in 2013, from Paulista.
[2] He made his first team – and Série A – debut on 1 November 2015, coming on as a late substitute for Jajá in a 2–0 away loss against Grêmio.
[3] On 19 April 2016, after impressing with the under-20s in the year's Copa São Paulo de Futebol Júnior, Ronaldo renewed his contract until 2020.
[4] He was rarely used in the following two campaigns, and was loaned to fellow top-tier side Atlético Goianiense on 5 September 2017, until the end of the year.
[7] After the end of contract with Flamengo, Ronaldo became a free agent and signed with J1 League club Shimizu S-Pulse on 1 July 2021.