Hasan made his international debut for Argentina on March 4, 1995 against fellow South Americans Uruguay. Argentina won the game, which was played in Buenos Aires and was a part of the Pan-American Championship. The final score was 44 to three to Argentina. Hasan scored a try in the game. He was capped another four times the following season in games against Uruguay, the Springboks and Canada. He came off the bench in games against England and the All Blacks.
He played nine Tests for Argentina in 1998. The following year he was included in Argentina's squad for the 1999 Rugby World Cup in Wales. He was capped twice the following season in games against South Africa and the English. He played three games for Argentina in 2001, against Wales, Scotland and the All Blacks. He was capped six times in 2002, and then the following year played in his second world cup, at the 2003 Rugby World Cup in Australia.
He was capped five times in 2004, three times during June, against Wales and the All Blacks, and twice in November, against France and Ireland. He was capped five times the following season. In 2006 he played in Argentina' mid-year Test against the All Blacks.
In 2007 he was selected to join the Argentina squad for the 2007 Rugby World Cup in France.
His final match came in the 2008 Top 14 Final, which he started for his club, Toulouse, and played the entire 80 minutes. Toulouse were crowned champions, ending Hasan's career on a winning note. Whilst at Toulouse he also won the 2005 Heineken Cup.[1]
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