New York-born teenager Yunus Musah has seen his value increase from 3.4 million euros to 8 million euros recently according to a valuation by CIES observatory.
It represents an increase of 4.6 million euros in a short period.
The 18-year-old has been exceptional since he was offered a starting role by the Spanish top flight side this season.
He has also been a subject of interest from multiple clubs around Europe and Valencia are aiming to sign him to a six-year deal.
He has played two friendlies for the USA national team so far and the country reportedly wants to make him one of their stars for the 2026 World Cup.
The former Arsenal youth player is still eligible to feature for England and Ghana in the future and both countries will be looking to convince him to switch allegiances.