He is on the books of Melipilla and wears shirt number 22. His main role on the pitch is Forward. His estimated market valuation currently stands at 50K €.

His latest transfer saw him join Sportivo Iteno from Cristóbal Colón Foot-Ball Club via on 2025-06-30.

During the CHI Liga de Ascenso 2024 campaign, Gustavo Guerreño made 18 appearances, scoring 1 goals and adding 0 assists. He averaged 0.1 goals per match from 0 shots, with 0 on target.