On 19 June 2020, he moved on loan to Brazilian club Vasco da Gama until 2022, and was initially assigned to the under-20 squad.

[1] After impressing with the under-20s, Galarza made his senior debut on 3 March 2021, after coming on as a half-time substitute for Vinícius in a 0–1 Campeonato Carioca home loss against Portuguesa;[2] at the age of 19, he became the youngest foreigner to play for Vasco in the 21st century.

[3] He scored his first goal as a professional on 24 March, netting his team's third in a 3–1 home success over Macaé.

[4] On 20 May 2021, Galarza signed a permanent contract with Vasco until 2025,[5] after the club bought 60% of his economic rights for a fee of US$ 500,000.

On 4 April 2022, Galarza moved to Série A side Coritiba on loan for the remainder of the year.