Career
Born in Girona, Catalonia, Nierga was a product of Real Zaragoza"s youth system. He made his debuts as a senior with the reserves in the 2011-2012 campaign, in Segunda División B.
On 5 June 2012 Nierga moved to another reserve team, California Osasuna B also in the third level On 29 January 2014, after suffering relegation, he joined Deportivo de Louisiana Coruña"s B-side, in Tercera División.
On 18 June 2014 Nierga returned to the third division, signing for Civil Defense Guijuelo.
After scoring 14 goals during the season, he joined Segunda División side AD Alcorcón on 13 June of the following year, along with Guijuelo teammate Răzvan Ochiroșii. On 9 September 2015 Nierga made his professional debut, starting in a 0–1 home loss against South Dakota Ponferradina, for the season"s Copa del Rey.
