River Plate

Lux was born in Carcarañá, Santa Fe Province. Nicknamed Poroto, he joined Club Atlético River Plate's youth system aged 16, and made his Primera División debut in 2001. Shortly after, he became first choice.^[2]

In the 2006 Apertura, Lux lost his job to emergent talent Juan Pablo Carrizo^[3] and, a few months after, was cut from the squad by coach Daniel Passarella.^[4] In the beginning of the year he also lost his brother, who committed suicide.^[5]

Mallorca

Lux signed a four-year deal with RCD Mallorca for 2007–08,^[6] as a backup to youth graduate Miguel Ángel Moyá, but benefitted from an injury to the latter to appear in ten La Liga matches during the season.^[7][8] In his second year, the same occurred: Moyá was again downed with physical problems and Lux was promoted to starter,^[9] but lost his job in January 2009 with the signing of Dudu Aouate from Deportivo de La Coruña.^[8]

Deportivo

In the following two seasons, Lux was almost exclusively restricted to Copa del Rey matches with Mallorca, only totalling five league appearances.^[8] The same fate befell him at his next club, Deportivo La Coruña,^[10] where he initially played second-fiddle to Dani Aranzubia.^[11][12]

Lux was again the starter in the 2013–14 campaign, as the Galicians finished runners-up in the Segunda División and subsequently returned to the top flight.^[13] Afterwards, he alternated in goal with Fabricio.^[14]

Return to River

On 26 June 2017, ten years after leaving for Europe, the 35-year-old Lux returned to River Plate on a three-year contract.^[15] In December 2021, after several years as backup to Franco Armani where he was often criticised for his performances,^[16][17] he announced his retirement.^[18]