Born in
Florida in the
Valle del Cauca Department of Colombia, Lamos began his career with local side CF Estrellas 2000. In 2009, he was loaned to
Categoría Primera A side
América de Cali, but after struggling for first-team football, he returned to Estrellas 2000. Later in the same year he was loaned again, this time to Polish
Ekstraklasa side
Jagiellonia Białystok, where he lodged with club captain
Tomasz Frankowski, who said of Lamos: "Gustavo has potential, he moves the ball quickly, he has good dribbling skills, but he has some things to improve. I hope that during these two months he will get enough of it tactically and physically". During his time with the club, he made one appearance, coming on as a substitute for
Kamil Grosicki in a 2–1 away loss to
Wisła Kraków on 29 August 2009. Despite signing on a one-year loan deal, he left the club in late 2009, and in 2010 would state that he was close to reaching an agreement to join permanently, but after failing to agree on terms, he returned to Colombia. He competed in the 2010 edition of '''', a Spanish reality TV show dedicated to finding young footballing talent from around the world, sponsored by both
Zinedine Zidane and
Enzo Francescoli, and hosted by
Nico Abad. He was one of seventeen players selected for the final group, before eventually coming fourth in the competition. ==Career statistics==