The pupil of Real, who spent the last two seasons in rent in Zaragoza and Eintracht, returned home.
The 20-year-old defender was introduced as a new player to Blancos, having received a T-shirt with the third number on his back, which Pepe had worn before him for 10 years.
Thus, in the next season Vallejo will compete with Nacho, Rafael Varanu and Sergio Ramos in the center of defense of the Royal Club.
"I am pleased to accept this challenge and take responsibility. I will give everything for the sake of this coat of arms on my chest, "said Jesus.
In the season that ended, Vallejo played 25 games for Eintracht, with one goal and one assists.