In October 2019, after impressing with the national team, Peglow was promoted to the first team for the following season,[4] and further extended his contract until December 2023 on 1 January 2020.[5] He made his senior debut on 25 July, coming on as a second-half substitute for Marcos Guilherme in a 1–1 Campeonato Gaúcho away draw against Esportivo.[6]
On 14 July 2021, Peglow joined Liga Portugal 2 side Porto B on a season-long loan deal with an option to buy.[7]
In early 2024, after loan spells with Atlético Goianiense, Dnipro-1 and Sport, Peglow terminated his contract with Internacional. Shortly after, on 19 March, he joined Polish Ekstraklasa club Radomiak Radom on a deal until mid-2026.[8] He made his debut on 5 April, coming onto the pitch in the 87th minute of a 2–1 home win over Raków Częstochowa.[9]