In 2016, he won the Goya Award for Best New Actor for his feature film debut in Nothing in Return.

He gained fame for his performances in television series Élite and Money Heist.

[3] A chance encounter with actor and director Daniel Guzmán in the streets of Madrid led to Herrán auditioning for the role of Darío in the film Nothing in Return (2015), which would earn him the Goya Award for Best New Actor.

[3] In 2017, he was cast as Aníbal Cortés (codename 'Río') in the Antena 3 series Money Heist, which was later picked up by Netflix.

[4] Herrán also acted in an advertisement for the Indian music streaming platform Gaana.