Nicolas Onuțu started playing rugby as a youth for French club Valence Sportif. In 2015 he was signed by Fédérale 1 club ROC La Voulte-Valence playing the for a year. In 2016 followed a move to SC Royannais and in 2017 he moved to Fédérale 2 club CS Vienne. In 2018 he was signed by Romanian SuperLiga side, CSM București.[2]