[2] At the age of ten in April 2014, he was invited to Spain to participate in a trial and youth tournament for Málaga and a second training period with Sevilla.
[3] While playing for GPS Puerto Rico in the Sheffield Cup in 2019, he was spotted by the International Development Academy based in Valencia and he and his family moved to Spain to join the club in summer 2020.
[4] After being the team's top scorer with twenty three goals in thirteen matches in the U19 league, the player attracted interest from La Liga clubs Barcelona, Almería, and Sevilla in spring 2022.
[15] De León made his debut for the senior national team on 6 June 2024 in a World Cup qualifier against El Salvador at the Estadio Cuscatlán.
[citation needed] Pundits have often tipped him as the "Puerto Rican Messi" due to his ability to run with the ball for long distances and finish goals with a high accuracy rate.