Born in the United States, he represents Mexico at youth level.

Tellez made his debut in the USL Championship for LA Galaxy II on October 12, 2022, against New Mexico United playing from the start, in Isotopes Park, Albuquerque.

[3] Tellez was named by English newspaper The Guardian as one of the best players born in 2005 worldwide.

[4] Tellez has been said by soccer journalist Jon Arnold to possess the “mentality and physical skills needed to play as a defensive midfielder” but more than that, has developed into a forward-thinking player as well due to his “abilities to turn in tight spaces or pull a trick out of his bag to dribble past defenders”.

[5] In August and September 2022, Tellez was called up to train with the Mexico national under-18 football team.