He switched code a first time, playing Rugby Union for U.S. Colomiers as a junior (under 20) player.

In 2001, Estebanez switched back to Rugby League, playing for Limoux XIII for three years before joining Toulouse XIII Olympique where, in 2005, he reached the semi-finals of the Challenge Cup.

He earned 25 caps for the France national rugby league team; once scoring 10 tries in a 120–0 rout of Serbia on 22 Oct 2003 in the 2003 Mediterranean Cup.

Since 2007, he plays in the Top 14 for CA Brive, primarily as a fly-half, but often as a centre.

On 20 January 2010, he was called by coach Marc Lievremont in the French squad for the 2010 Six Nations Championship.