أونس كالداس
Galván Rey's first club was Boca Juniors of his native Argentina, where he did not achieve much success. Galván Rey joined Colombian club Once Caldas in 1994, and proceeded to become one of the most dangerous forwards in Colombia. He scored 171 goals in his career with Once Caldas, 160 in the Colombian league, and 11 in 15 Copa Libertadores matches. In 2003, Galván Rey helped Once Caldas to win the Colombian championship, their first in 53 years; additionally, he led the team to achieve Copa Libertadores qualification in 1999, 2002, and 2004.