Romero broke an 81-year record to become La Liga’s youngest ever player when appearing as a substitute for Real Mallorca against Real Madrid in June.
The 15-year-old is said to be one of the highest rated talents in Spanish football and United officials have been monitoring his progress and have made an enquiry into his status.
Romero arrived in Spain aged three when he first lived in Villanueva de Córdoba and he now is a resident of Mallorca, with the club paying his wage – said to be €1k per month – and all his rents and utility bills.
He signed for the club as a 10-year-old in 2015 and began training with Mallorca’s first-team squad in June, although he is not yet on a professional deal due to his wage and could feasibly move elsewhere if he is attracted into doing so.
Born in the Mexican city of Durango, he holds three nationalities – Mexican, Argentinean – whom he has represented up to Under-17 category at youth level – and Spanish, as highlighted by Marca.