Early career Montefiori's first club was San Antonio in
San Antonio de Padua, where he played at the age of three. While watching one of his mother's matches, he was approached by
River Plate youth coach, Luis Pereyra, who invited him to train with the club's youth team. he only played a total of fifteen minutes in his first season, claiming that his coaches asked him to make more sacrifices in order to play, and left the club at the end of the year.
Move to England Montefiori would again try his luck in Europe, this time moving to England, joining
Crewe Alexandra in October 2019. However, after two months, including training with the first team, the club decided against signing him, as they would have to pay a compensation fee to do so, because Montefiori had moved to England before turning eighteen. Such was his ability, then-manager
David Artell reportedly told Montefiori: "if you had the passport, tomorrow I would give you 20 minutes against Aston Villa". His career with Nantwich Town started well; having impressed in pre-season, he scored on his first competitive appearance - a 3–2 win over
Stalybridge Celtic.
Move to Brazil In May 2022, having left England, Montefiori went on trial with Brazilian side
Grêmio, before signing for the club's under-23 side the following month. However, after just two months with the club, his contract was terminated in August, with Grêmio reportedly worried they would have to pay training compensation. Immediately following his departure from Grêmio, he signed a deal with
Guarany until December 2022, to help the team compete in the
Copa FGF. Following one game for Guarany, a 5–1 Copa FGF win against Onze Horas, he signed a deal with
Série B side
Juventude in November 2022, joining the club for the 2023 season. After a handful of appearances in the
Copa FGF for Juventude's B team, Montefiori was the club's top scorer in the
2024 edition of the
Copa São Paulo de Futebol Júnior. Despite this, he failed to feature any further for Juventude, and following his release from the club, he returned to England to join
Stafford Rangers in August 2024. Despite receiving international clearance, he was unable to get a valid work permit from the
Home Office, and left the club without making an appearance just a month after joining. Having returned to Brazil, he joined
Monsoon in early 2025. After ten appearances in the
Campeonato Gaúcho, he joined
Ypiranga-RS in March 2025. Ahead of the 2026 season, he joined
Primavera. ==Career statistics==