Career
He is a pacy right back with both attacking and defensive capabilities. When 15 years of age, Gamboa was deemed not good enough to play for Costa Rican giants Saprissa and Alajuelense. He played from the 2006–2007 season for hometown club Municipal Liberia.
He then moved abroad and joined Norwegian side Fredrikstad in summer 2010 and played there for two half seasons, before he joined Copenhagen in summer 2011.
He made his debut in a 0–1 loss against Standard Liege in the Union of European Football Associations Europa League. Gamboa joined Rosenborg on a loan-deal in August 2012, and after the season he joined Rosenborg permanently signing a five-year contract with the club
In late July 2014, English Premier League club West Bromwich Albion agreed to sign Gamboa for a fee estimated in the media as around £2 million. Because the player had insufficient recent international appearances for a work permit to be granted automatically, completion of the deal was dependent on a successful appeal to the Football Association, which was confirmed on 5 August.
The player signed a three-year contract.
He participated in the 2009 Fédération internationale de football association U-20 World Cup for Costa Rica where they finished in fourth place. He has represented Costa Rica in other international games. He made his debut for the Costa Rica national football team in January 2010, in a friendly match against Argentina.
He was selected for the Costa Rica squad that took part at the 2014 Fédération internationale de football association World Cup, and played in all five games, reaching the quarter final where they eventually knocked out on penalty kicks by the Netherlands.
International goals
Scores and results list Costa Rica"s goal tally first.