In June, after impressing with the under-20s, Oller moved to Hellas Verona on loan,[2] but could not play for the club due to paperwork issues. Upon returning, he moved to Santos also on loan.[1]
Oller appeared with the main squad once, being an unused substitute in a 3–0 Copa do Brasil away win against Galvez on 11 May 2016.[3] The following 3 January, he joined URT for the ensuing Campeonato Mineiro.[4]
For the 2018 season, Oller represented Uberaba,[5] URT[6] and América Mineiro's under-23 squad.[7] Promoted to América's first team for the 2019 campaign,[8] he returned to URT for a third spell in February, on loan.[9]
Announced by Uberaba in March 2019,[10] Oller joined Ferroviária instead on 8 May.[11] He moved to Anápolis on 6 January of the following year,[12] playing in the Campeonato Goiano for the club before agreeing to a contract with Portuguesa Santista on 5 August.[13]
In December 2020 Rafael Oller was hired to reinforce the Operário PR for the Série B sequence with a contract until May 2021 [14] With his good performances, he won the ge.com poll as the most beautiful Serie B goal and was nominated for the 2021 Puskas awards. led the club to renew with the player until December 2021.
^"Rafael Oller é o novo reforço da Ferroviária" [Rafael Oller is the new addition of Ferroviária] (in Brazilian Portuguese). Associação Ferroviária de Esportes. 8 May 2019. Archived from the original on 11 May 2019. Retrieved 19 November 2020.