Lucas Martín Valdemarín (born 13 May 1978) is a former footballer from Argentina who played for Vélez, Unión Española (Chile), Elche (Spain), AIK (Sweden) and Club San Luis (Mexico).
During his period at Vélez Valdemarín struggled to earn a spot in the first team, and the club loaned him to other teams multiple times: to Independiente Rivadavia and Racing Club in Argentina, Unión Española of Chile and Elche CF from Spain, with two more spells with Vélez in between.
In 2006, he became a free agent and signed for Arsenal de Sarandí, where he formed a striker partnership with Mauro Óbolo.
In 2008 Valdemarín reached a mutual agreement with AIK to terminate his contract, and joined Colón de Santa Fe.
[2] Back in Colón he couldn't secure a place in the squad, and transferred to Defensa y Justicia in July 2009.