Álvaro Fidalgo hails from Hevia, Siero, Asturias, Spain. He joined Real Madrid's youth academy, La Fábrica, in 2012, where he developed his skills before making his senior debut with the club's reserve team. Fidalgo made his first-team debut on December 6, 2018, during a Copa del Rey match against UD Melilla, showcasing his potential in a match that ended 6-1 in favor of Real Madrid. A notable moment in his career came during his time with Club América, where he helped the team secure three Liga MX championships from 2023 to 2024.
Fidalgo is known for his abilities as a technical midfielder, contributing both in defense and attack. As of February 1, 2026, he returned to Spain to join Real Betis, where he plays a crucial role in the team's midfield dynamics.
On the international stage, Fidalgo initially represented Spain at youth levels, but in 2026, he officially switched his allegiance to Mexico. He made his senior debut for the Mexico national team on March 28, 2026, in a friendly match against Portugal.