Valerga was born in Buenos Aires, Argentina on August 19, 1971. He became a Grandmaster in 1994, joining the ranks of elite players necessary in the world.
Valerga has also represented Argentina in international competitions. He was a member of the Argentine team that won the bronze medal at the 2002 Chess Olympiad in Bled, Slovenia. In 2003, he competed in the FIDE World Chess Championship, where he was knocked out in the second round.