López made his debut in the Costa Rican Primera División on 5 January 1992 playing with Carmelita against ASODELI also scoring his first league goal in that match.

[5] He is also known as El Ingeniero (The Engineer) due to his amazing ability to create plays with short and long passes and also for his fast thinking that made him one of the best midfielders in the region during the '90s and the early 2000s.

[8] López made his debut for Costa Rica in an August 1995 friendly match against Japan[1] and earned a total of 76 caps, scoring 6 goals.

On Wednesday 22 July 2009, López played his retirement match[19] with Alajuelense against a team of friends that he picked himself.

"El Pato" was one of the most loved players in Alajuelense, along with his devotion to "La 12", the official group of Fans.