Soccer player best known for his years as a centre back for Real Madrid, with whom he won the 2017 FIFA Club World Cup. He previously represented Spain at the 2015 UEFA European Under-19 Championship.
He joined his hometown youth squad Real Zaragoza in 2007. He made his debut on the senior squad in 2014.
He was named to the Segunda División Team of the Year for his stellar 2015-15 season with Real Zaragoza.
His parents are Jesús Vallejo and Josefina Lázaro. He began dating nutritionist María Delgado.
He has played with star defender Sergio Ramos at Real Madrid.