Nicolas Clausells has been a playing for Catalans Dragons since around 2011 and has been a key player in multiple successful Elite One Championship campaigns with the club.

In 2023, Clausells helped Catalans to win the inaugural European Club Challenge against UK champions Halifax scoring twice in a 32–32 draw resulted in a shared title.

[2] A few months later he scored five tries and eight goals helping Catalans secure their first Challenge Cup, with the club making their debut the UK competition the season prior.

[3] Catalans retained the Challenge Cup in 2024, beating Wigan 81–18 in the final, scoring three tries and kicking for goals.

[9] In the 2024 internationals, Clausells scored 28 points in France's 32–28 over England after coming off the bench around the 30th minute.