The 18-year-old didn’t make a senior appearance for the La Liga outfit but arrives in East London with a potent record at youth level, amassing 100 goals over the last four seasons. He also represented Los Che in the UEFA Youth League earlier this term, notching up one goal and three assists in eight appearances.
Martinez will officially sign for the Hammers during the summer transfer window, but Valencia have given the teenager permission to train with his new club immediately to help him settle in the English capital.
Some have compared Martinez in style to former Liverpool and Chelsea star Fernando Torres and like his compatriot, West Ham’s latest signing has already achieved noteworthy success with Spain at U19 level – lifting the European Championship title in 2015.
Upon signing a three-year contract with West Ham, the prodigious forward said; “For me, it’s a great opportunity to be here and I hope to make the most of being at such a big club. I joined West Ham because of the progress that the club is making. The decision to come here was made because it is a brilliant opportunity to join an interesting club in the Premier League.”