Club Deportivo y Social Colo-Colo B, usually called Colo-Colo B, is a Chilean football team from Santiago. They are the reserve team of Colo-Colo, and are currently competing in the third tier of Chilean football, the Segunda División.Founded in January 1999, the club played its first season in the Chilean Third Division, via an under–23 team of the club called Colo-Colo Junior, in where players like Sebastián González and Luis Ignacio Quinteros, become to stars.