Wisniewski started playing rugby at a youth level for
Gaillac. In 2000, he left for
Castres, but only stayed for one year, joining the
Toulouse youth academy in 2001 at age 16. He signed his first professional contract for
Aix-en-Provence, He overtook All-Black legend
Andrew Mehrtens as first-choice fly-half in his first season for the club, and has remained first choice since, despite the arrival of such big names as
François Steyn and
Juan Martín Hernández. He was an integral part of Racing's
first Heineken Cup campaign, that ended in the group stage, behind
Leinster and
Clermont, but in front of
Saracens. ==International career==