Rosello won the 2007 Cadet European Championships in Novi Sad and the 2007 Cadet World Championships in Belek. The year after he earned a bronze medal at the 2008 Junior World Championships. These results caused him to be selected into the Spanish épée national team. He took part in the 2012 European Championships and the 2013 European and 2013 World Championships. In the 2013–14 season Spain created a surprise by defeating favourites France in the quarter-finals, then Russia in the semi-finals. They lost to Switzerland in the final and took a silver medal, Spain's first continental podium since Jorge Pina's gold medal at Gand 2007.