At the beginning of 2006, and after conflicts with then coach of the Universidad de Chile, Héctor Pinto, Rivarola signed with Argentinos Juniors, but failed to establish himself as part of the team's starting 11 and moved to the Venezuelan club UA Maracaibo few months later.
Afterwards he returned to Venezuelan football, he was part of the Maracaibo team that won the Primera División in 2004-05.
Gregory Evans Lancken Williams (born 7 May 1979 in Ciudad Bolivar) is a Venezuelan football defender currently playing for Maracaibo of Venezuela.
Soviet Union | European Union | Union Army | rugby union | Union | International Telecommunication Union | trade union | Union (American Civil War) | Union Pacific Railroad | England national rugby union team | American Civil Liberties Union | Wales national rugby union team | New Zealand national rugby union team | Ireland national rugby union team | Western Union | Maracaibo | Scotland national rugby union team | International Astronomical Union | Georgia national rugby union team | Trade union | International Union for Conservation of Nature | Border Union Railway | France national rugby union team | United States national rugby union team | South Africa national rugby union team | Communist Party of the Soviet Union | Amateur Athletic Union | Union Carbide | Australia national rugby union team | Union Theological Seminary |