Career
He also played in the only Copa Interamericana final played by a Guatemalan team After a 1–1 aggregate against Argentina"s Independiente, Monterroso missed during the penalty shootout. Monterroso scored 21 goals in all competitions for Municipal, and after a decade at the club, he played for the clubs Juventud Retalteca (1980 to 1981), Cobán Imperial (1982 to 1986) and Comunicaciones (1987).
During the 1974 World Cup qualification, Mincho played four matches, scoring one goal against Haiti.
He then was part of the squad that qualified to the 1976 Olympic tournament, playing in all three of Guatemala"s matches at the Olympic Games in Montreal. In 1976 and 1977, he played in eleven matches during the 1978 World Cup qualification process, scoring one goal against El Salvador.
Monterroso coached the Guatemala national team from December 1998 to December 1999, during which time the team finished runner-up at the 1999 UNCAF Nations Cup. He coached the Olympic squad during part of the qualification campaign for the 2000 Olympic Games.
He was named national team coach a second time from December 2003 to 2004, without coaching any official matches.
Among the clubs Monterroso coached are Municipal (1997 to 1998, promoting eventual international forward Carlos Ruiz), Universidad de San Carlos (2003 Clausura), Deportivo Jalapa (2004 to 2005), and Suchitepéquez (2005). In January 2007, he was appointed head coach of the Guatemala women"s national football team, but in October 2008 he returned to coaching the men"s national team, as the successor to Ramón Maradiaga. remaining in charge until 2009. Monterroso became the manager of club Unifut in the women"s top division of Guatemala in 2010, winning four consecutive league titles as of the end of 2011.
He was appointed coach of the Guatemala women"s U-20 team on 6 February 2012.