[2][3] The top goalscorer of the under-19 team, he was on the bench in the Chilean Primera División match against Unión La Calera on 29 September 2018.

[3] He has taken part of a successful stint of Magallanes, winning three consecutive titles: the 2022 Primera B, getting the promotion to the Chilean top division, the 2022 Copa Chile, qualifying for the 2023 Copa Libertadores,[7] and the 2023 Supercopa de Chile versus Colo-Colo.

[8] Alfaro has taken part of training microcycles of the Chile senior team with the coaches Reinaldo Rueda and Martín Lasarte.

[11] He received his first call up for the 2026 FIFA World Cup qualifiers against Uruguay and Colombia in September 2023.

[12] He was included in the final squad for the 2023 Pan American Games,[13][14] where Chile won the silver medal.