Fagúndez is a former youth academy player of Montevideo Wanderers and Danubio.[2] In January 2020, he joined Nacional and initially started to play with club's reserve team.[3] He made his professional debut for Nacional on 19 November 2021 in a 1–0 league win against Cerrito.[4] On 13 March 2022, he scored his first goal for the club in a 1–1 draw against Montevideo City Torque.[5]