He never played professionally in his country, representing several clubs in France and Switzerland and appearing with the latter national team at the 1994 World Cup.

The son of a former FC Mulhouse player, also called Néstor and also a striker, Subiat was born in Buenos Aires, Argentina, and started his career precisely at the French club, as a defender but already showing scoring abilities, which prompted a move up front.

[1][2] After a loan at RC Strasbourg Alsace, Subiat played until 1992 at Mulhouse, scoring a further 25 goals combined as both seasons were spent in Ligue 2.

[1] Subiat joined FC Basel's first team on loan for the first half of their 1997–98 season under head coach Jörg Berger.

Subiat played his domestic league debut for the club in the home game in the St. Jakob Stadium on 28 September 1997 as Basel were defeated 0–1 by Lausanne-Sport.