Tristán Suárez were Monserrat's first club, as he began featuring for them in Primera B Metropolitana from 2015.[2][3] Twenty-six appearances came in the aforementioned campaign, sixteen of which were as a starter.[2] He didn't appear in the 2016 Primera B Metropolitana, though returned in 2016–17 to play twenty-five times; all but one was a start.[2][4] However, Monserrat played just one minute of senior football in the succeeding season, which led to his departure from Tristán Suárez in July 2018 to Almirante Brown.[2][5][6] He made his debut during a defeat to Estudiantes in the third tier on 20 August.[2]