In 2009, Herreros played for the Chilean U20s team at the Junior World Rugby Trophy tournament in Kenya.[1][2]
He played for Tribe 7s in Australia.[3] In 2016, he captained one of the two Queensland Reds teams in the National 7s Championship.[4][5] He also had stints in New Zealand and France.[1][6]
He was part of the Chilean sevens team that competed in the 2016–17 World Series, specifically in the Las Vegas and Vancouver rounds.[1]
He spent four years with Spanish club, Aparejadores Rugby, since joining them in 2018.[7][8] In 2021, he signed with Spanish franchise, the Iberians, who compete in the Rugby Europe Super Cup league.[9]
Herreros made his international debut for Chile against Brazil in 2021.[7] He played for Selknam in the Super Rugby Americas competition.[5][7]
He was selected in Chile's squad for the 2023 Rugby World Cup in France.[1][10] He made his World Cup debut from off the bench against Argentina.[11] Following the World Cup, he joined Portuguese club, Agronomia, in the Campeonato Português de Rugby competition.[5][7]